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x/2-15=-21
We move all terms to the left:
x/2-15-(-21)=0
We add all the numbers together, and all the variables
x/2+6=0
We multiply all the terms by the denominator
x+6*2=0
We add all the numbers together, and all the variables
x+12=0
We move all terms containing x to the left, all other terms to the right
x=-12
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