Respuesta :

a(b+c)=ab+ac

reverse
ab+ac=a(b+c)
a is a common factor

find common factors of 24 and 40

24=2*2*2*3
40=2*2*2*5
common factor is 2*2*2=8

a=8
8(3)+8(5)=8(3+5)=8(8)=64
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