-9(-4b)=20

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Solution for -9(-4b)=20 equation: 



-9(-4b)=20

We move all terms to the left:

-9(-4b)-(20)=0

We multiply parentheses

36b-20=0

We move all terms containing b to the left, all other terms to the right

36b=20

b=20/36

b=5/9

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