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7v-9v+3v-15v-18v=16
We move all terms to the left:
7v-9v+3v-15v-18v-(16)=0
We add all the numbers together, and all the variables
-32v-16=0
We move all terms containing v to the left, all other terms to the right
-32v=16
v=16/-32
v=-1/2
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