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a+5=2a-7
We move all terms to the left:
a+5-(2a-7)=0
We get rid of parentheses
a-2a+7+5=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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