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15=2a-16
We move all terms to the left:
15-(2a-16)=0
We get rid of parentheses
-2a+16+15=0
We add all the numbers together, and all the variables
-2a+31=0
We move all terms containing a to the left, all other terms to the right
-2a=-31
a=-31/-2
a=15+1/2
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