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19=4v-9
We move all terms to the left:
19-(4v-9)=0
We get rid of parentheses
-4v+9+19=0
We add all the numbers together, and all the variables
-4v+28=0
We move all terms containing v to the left, all other terms to the right
-4v=-28
v=-28/-4
v=+7
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