a+3(a-2)=15

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Solution for a+3(a-2)=15 equation: 



a+3(a-2)=15

We move all terms to the left:

a+3(a-2)-(15)=0

We multiply parentheses

a+3a-6-15=0

We add all the numbers together, and all the variables

4a-21=0

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

4a=21

a=21/4

a=5+1/4

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