2(a-9)-a=-15

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Solution for 2(a-9)-a=-15 equation: 



2(a-9)-a=-15

We move all terms to the left:

2(a-9)-a-(-15)=0

We add all the numbers together, and all the variables

-1a+2(a-9)+15=0

We multiply parentheses

-1a+2a-18+15=0

We add all the numbers together, and all the variables

a-3=0

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

a=3

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