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-1-3(v-7)=-15+4v
We move all terms to the left:
-1-3(v-7)-(-15+4v)=0
We add all the numbers together, and all the variables
-3(v-7)-(4v-15)-1=0
We multiply parentheses
-3v-(4v-15)+21-1=0
We get rid of parentheses
-3v-4v+15+21-1=0
We add all the numbers together, and all the variables
-7v+35=0
We move all terms containing v to the left, all other terms to the right
-7v=-35
v=-35/-7
v=+5
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