-4(5+3b)=21

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Solution for -4(5+3b)=21 equation: 



-4(5+3b)=21

We move all terms to the left:

-4(5+3b)-(21)=0

We add all the numbers together, and all the variables

-4(3b+5)-21=0

We multiply parentheses

-12b-20-21=0

We add all the numbers together, and all the variables

-12b-41=0

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

-12b=41

b=41/-12

b=-3+5/12

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