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5=9-a/2
We move all terms to the left:
5-(9-a/2)=0
We add all the numbers together, and all the variables
-(-a/2+9)+5=0
We get rid of parentheses
a/2-9+5=0
We multiply all the terms by the denominator
a-9*2+5*2=0
We add all the numbers together, and all the variables
a-8=0
We move all terms containing a to the left, all other terms to the right
a=8
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