7-3(2-7a)=-83

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Solution for 7-3(2-7a)=-83 equation: 



7-3(2-7a)=-83

We move all terms to the left:

7-3(2-7a)-(-83)=0

We add all the numbers together, and all the variables

-3(-7a+2)+7-(-83)=0

We add all the numbers together, and all the variables

-3(-7a+2)+90=0

We multiply parentheses

21a-6+90=0

We add all the numbers together, and all the variables

21a+84=0

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

21a=-84

a=-84/21

a=-4

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