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-2a=-3a+12-29
We move all terms to the left:
-2a-(-3a+12-29)=0
We add all the numbers together, and all the variables
-2a-(-3a-17)=0
We get rid of parentheses
-2a+3a+17=0
We add all the numbers together, and all the variables
a+17=0
We move all terms containing a to the left, all other terms to the right
a=-17
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