-20=4(3b+6)+4(5b-3)

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Solution for -20=4(3b+6)+4(5b-3) equation: 



-20=4(3b+6)+4(5b-3)

We move all terms to the left:

-20-(4(3b+6)+4(5b-3))=0



We calculate terms in parentheses: -(4(3b+6)+4(5b-3)), so:

4(3b+6)+4(5b-3)

We multiply parentheses

12b+20b+24-12

We add all the numbers together, and all the variables

32b+12

Back to the equation:

-(32b+12)



We get rid of parentheses

-32b-12-20=0

We add all the numbers together, and all the variables

-32b-32=0

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

-32b=32

b=32/-32

b=-1

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