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7(-1+7v)=140
We move all terms to the left:
7(-1+7v)-(140)=0
We add all the numbers together, and all the variables
7(7v-1)-140=0
We multiply parentheses
49v-7-140=0
We add all the numbers together, and all the variables
49v-147=0
We move all terms containing v to the left, all other terms to the right
49v=147
v=147/49
v=3
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