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20+20-10v=-15v-20
We move all terms to the left:
20+20-10v-(-15v-20)=0
We add all the numbers together, and all the variables
-10v-(-15v-20)+40=0
We get rid of parentheses
-10v+15v+20+40=0
We add all the numbers together, and all the variables
5v+60=0
We move all terms containing v to the left, all other terms to the right
5v=-60
v=-60/5
v=-12
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