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x/6+15=-21
We move all terms to the left:
x/6+15-(-21)=0
We add all the numbers together, and all the variables
x/6+36=0
We multiply all the terms by the denominator
x+36*6=0
We add all the numbers together, and all the variables
x+216=0
We move all terms containing x to the left, all other terms to the right
x=-216
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