7(a-3)=3a+15

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Solution for 7(a-3)=3a+15 equation: 



7(a-3)=3a+15

We move all terms to the left:

7(a-3)-(3a+15)=0

We multiply parentheses

7a-(3a+15)-21=0

We get rid of parentheses

7a-3a-15-21=0

We add all the numbers together, and all the variables

4a-36=0

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

4a=36

a=36/4

a=9

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