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-a/2=5
We move all terms to the left:
-a/2-(5)=0
We multiply all the terms by the denominator
-a-5*2=0
We add all the numbers together, and all the variables
-1a-10=0
We move all terms containing a to the left, all other terms to the right
-a=10
a=10/-1
a=-10
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