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142=9+7v
We move all terms to the left:
142-(9+7v)=0
We add all the numbers together, and all the variables
-(7v+9)+142=0
We get rid of parentheses
-7v-9+142=0
We add all the numbers together, and all the variables
-7v+133=0
We move all terms containing v to the left, all other terms to the right
-7v=-133
v=-133/-7
v=+19
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