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5+a/2=-4
We move all terms to the left:
5+a/2-(-4)=0
We add all the numbers together, and all the variables
a/2+9=0
We multiply all the terms by the denominator
a+9*2=0
We add all the numbers together, and all the variables
a+18=0
We move all terms containing a to the left, all other terms to the right
a=-18
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