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The first opposite operation is: 2x + 15 = 21 –15 ? +15 × 2 ÷ 2 2x + 15 = 21 2x = –15 –15 The next opposite operation is: 2x + 15 = 21 2x = 6 –15 × 2 ÷ 2 ? –15 2x + 15 = 21 2x = 6 –15 ÷ 2 x = ÷ 2 –15 The first opposite operation is: 7x − 8 = 55 + 8 ? − 8 × 7 ÷ 7 7x − 8 = 55 7x = + 8 +8 The next opposite operation is: 7x − 8 = 55 7x = 63 + 8 ÷ 7 ? × 7 +8 7x − 8 = 55 7x = 63 ÷ 7 + 8 x = ÷ 7 +8 The first opposite operation is: –3x + 11 = –4 + 11 –11 ? +3 − 3 –3x + 11 = –4 –3x = – 11 – 11 The next opposite operation is: –3x + 11 = –4 –3x = –15 ÷ – 3 ? + 3 – 11 – 11 –3x + 11 = –4 –3x = –15 ÷ − 3 – 11 x = ÷ − 3 – 11 The first opposite operation is: 28 – 5x = 13 − 5 + 28 + 5 – 28 ? – 28 28 – 5x = 13 – 5x = – 28 The next opposite operation is: – 28 28 – 5x = 13 – 5x = –15 ÷ − 5 ? + 5 – 28 – 28 28 – 5x = 13 – 5x = –15 ÷ − 5 x = – 28 ÷ − 5 The next line is: 4(x – 3) = 20 4x – 12 = 20 ? 4x – 3 =20 The first opposite operation is: 4(x – 3) = 20 4x – 12 = 20 + 12 ? ÷ 4 × 4 − 12 4(x – 3) = 20 4x – 12 = 20 4x = +12 +12 The next opposite operation is: 4(x – 3) = 20 4x – 12 = 20 ÷ 4 ? – 4 4x = 32 +12 +12 4(x – 3) = 20 4x – 12 = 20 4x = 32 +12 ÷ 4 x = +12 ÷ 4 The simplest opposite operation is: 2 x + 3 = 9 – 3 ? × 2 + 3 ÷ 2 2 x + 3 = 9 2 x – 3 = – 3 The next opposite operation is: 2 x + 3 = 9 2 x – 3 × 2 ? ÷ 2 = 6 – 3 2 x + 3 = 9 2 x – 3 × 2 x = = 6 – 3 × 2 The simplest opposite operation is: x + 7 4 = 5 – 7 × 4 ? ÷ 4 + 7 x + 7 x + 7 = 4 x 4 = 5 x 4 The next opposite operation is: x + 7 x + 7 = 20 4 x 4 = 5 – 7 ? +7 x 4 x + 7 x + 7 = 20 4 – 7 x 4 x = = 5 – 7 x 4 The first opposite operation is: 3x − 2.6 = 7.9 ÷ 3 – 2.6 + 2.6 ? × 3 3x − 2.6 = 7.9 + 2.6 3x = + 2.6 The next opposite operation is: 3x − 2.6 = 7.9 + 2.6 3x = 10.5 ÷ 3 ? × 3 + 2.6 3x − 2.6 = 7.9 + 2.6 3x = 10.5 ÷ 3 x = + 2.6 ÷ 3 |