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

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Solution for 3(7a-3)+3=-90 equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(7a-3)+93=0

We multiply parentheses

21a-9+93=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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