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(4v-4)+(5v-5)=180
We move all terms to the left:
(4v-4)+(5v-5)-(180)=0
We get rid of parentheses
4v+5v-4-5-180=0
We add all the numbers together, and all the variables
9v-189=0
We move all terms containing v to the left, all other terms to the right
9v=189
v=189/9
v=21
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