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9=6-a/2
We move all terms to the left:
9-(6-a/2)=0
We add all the numbers together, and all the variables
-(-a/2+6)+9=0
We get rid of parentheses
a/2-6+9=0
We multiply all the terms by the denominator
a-6*2+9*2=0
We add all the numbers together, and all the variables
a+6=0
We move all terms containing a to the left, all other terms to the right
a=-6
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