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20v+10+19v-4+18v+3=180
We move all terms to the left:
20v+10+19v-4+18v+3-(180)=0
We add all the numbers together, and all the variables
57v-171=0
We move all terms containing v to the left, all other terms to the right
57v=171
v=171/57
v=3
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