3(4a+7)-3=90

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Solution for 3(4a+7)-3=90 equation: 



3(4a+7)-3=90

We move all terms to the left:

3(4a+7)-3-(90)=0

We add all the numbers together, and all the variables

3(4a+7)-93=0

We multiply parentheses

12a+21-93=0

We add all the numbers together, and all the variables

12a-72=0

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

12a=72

a=72/12

a=6

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