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Factorising
= 5(2x +
10x + 15
5 x __ = 15 ???
)
= 3(4a +
12a + 3
3 x __ = 3 ???
)
= 10( b –
10b – 40
10 x __ = 40 ???
)
= 4( c –
8c – 20
4 x __ = 20 ???
)
= 5(     + 3)
5 x __ = 5d ???
5d + 15
= 2(     + 7)
2 x __ = 12e ???
12e + 14
= 3(     – 2)
3 x __ = 15f ???
15f – 6
= 7(     – 3)
7 x __ = 14g ???
14g – 21
= 5(     +
20h + 15
)
= 6(     –
18i – 30
)
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