3(a+7)-3=9(a+12)

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Solution for 3(a+7)-3=9(a+12) equation: 



3(a+7)-3=9(a+12)

We move all terms to the left:

3(a+7)-3-(9(a+12))=0

We multiply parentheses

3a-(9(a+12))+21-3=0



We calculate terms in parentheses: -(9(a+12)), so:

9(a+12)

We multiply parentheses

9a+108

Back to the equation:

-(9a+108)



We add all the numbers together, and all the variables

3a-(9a+108)+18=0

We get rid of parentheses

3a-9a-108+18=0

We add all the numbers together, and all the variables

-6a-90=0

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

-6a=90

a=90/-6

a=-15

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