a+3(a-7)=9

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Solution for a+3(a-7)=9 equation: 



a+3(a-7)=9

We move all terms to the left:

a+3(a-7)-(9)=0

We multiply parentheses

a+3a-21-9=0

We add all the numbers together, and all the variables

4a-30=0

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

4a=30

a=30/4

a=7+1/2

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