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78=5v+13
We move all terms to the left:
78-(5v+13)=0
We get rid of parentheses
-5v-13+78=0
We add all the numbers together, and all the variables
-5v+65=0
We move all terms containing v to the left, all other terms to the right
-5v=-65
v=-65/-5
v=+13
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