Factorise: 12ab -2b ( 5 - 4a ) - 15
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12ab - 2b ( 5-4a) - 15 .
Step-by-step explanation:
12ab - 10 b + 8 ab - 15 .= 12ab + 8 ab - 10 b - 15= 20 ab - 10 b - 15
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