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v/9=-21
We move all terms to the left:
v/9-(-21)=0
We add all the numbers together, and all the variables
v/9+21=0
We multiply all the terms by the denominator
v+21*9=0
We add all the numbers together, and all the variables
v+189=0
We move all terms containing v to the left, all other terms to the right
v=-189
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