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9+a/2=5
We move all terms to the left:
9+a/2-(5)=0
We add all the numbers together, and all the variables
a/2+4=0
We multiply all the terms by the denominator
a+4*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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