2a-3(a-1)=15

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Solution for 2a-3(a-1)=15 equation: 



2a-3(a-1)=15

We move all terms to the left:

2a-3(a-1)-(15)=0

We multiply parentheses

2a-3a+3-15=0

We add all the numbers together, and all the variables

-1a-12=0

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

-a=12

a=12/-1

a=-12

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