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40=4v+8
We move all terms to the left:
40-(4v+8)=0
We get rid of parentheses
-4v-8+40=0
We add all the numbers together, and all the variables
-4v+32=0
We move all terms containing v to the left, all other terms to the right
-4v=-32
v=-32/-4
v=+8
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