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4+a/2=-2
We move all terms to the left:
4+a/2-(-2)=0
We add all the numbers together, and all the variables
a/2+6=0
We multiply all the terms by the denominator
a+6*2=0
We add all the numbers together, and all the variables
a+12=0
We move all terms containing a to the left, all other terms to the right
a=-12
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