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