-3(7+5b)=84

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Solution for -3(7+5b)=84 equation: 



-3(7+5b)=84

We move all terms to the left:

-3(7+5b)-(84)=0

We add all the numbers together, and all the variables

-3(5b+7)-84=0

We multiply parentheses

-15b-21-84=0

We add all the numbers together, and all the variables

-15b-105=0

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

-15b=105

b=105/-15

b=-7

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