(21b-5)-5(4b+4)=-4

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Solution for (21b-5)-5(4b+4)=-4 equation: 



(21b-5)-5(4b+4)=-4

We move all terms to the left:

(21b-5)-5(4b+4)-(-4)=0

We add all the numbers together, and all the variables

(21b-5)-5(4b+4)+4=0

We multiply parentheses

(21b-5)-20b-20+4=0

We get rid of parentheses

21b-20b-5-20+4=0

We add all the numbers together, and all the variables

b-21=0

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

b=21

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