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-18v+3v+-17v-4v+9v+18=-9
We move all terms to the left:
-18v+3v+-17v-4v+9v+18-(-9)=0
We add all the numbers together, and all the variables
-27v+27=0
We move all terms containing v to the left, all other terms to the right
-27v=-27
v=-27/-27
v=1
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