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-2a+18=2a-10
We move all terms to the left:
-2a+18-(2a-10)=0
We get rid of parentheses
-2a-2a+10+18=0
We add all the numbers together, and all the variables
-4a+28=0
We move all terms containing a to the left, all other terms to the right
-4a=-28
a=-28/-4
a=+7
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