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v/4+16=21
We move all terms to the left:
v/4+16-(21)=0
We add all the numbers together, and all the variables
v/4-5=0
We multiply all the terms by the denominator
v-5*4=0
We add all the numbers together, and all the variables
v-20=0
We move all terms containing v to the left, all other terms to the right
v=20
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