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a/2+4=-12
We move all terms to the left:
a/2+4-(-12)=0
We add all the numbers together, and all the variables
a/2+16=0
We multiply all the terms by the denominator
a+16*2=0
We add all the numbers together, and all the variables
a+32=0
We move all terms containing a to the left, all other terms to the right
a=-32
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