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-5a+12=2a-16
We move all terms to the left:
-5a+12-(2a-16)=0
We get rid of parentheses
-5a-2a+16+12=0
We add all the numbers together, and all the variables
-7a+28=0
We move all terms containing a to the left, all other terms to the right
-7a=-28
a=-28/-7
a=+4
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