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-v/5=4.2
We move all terms to the left:
-v/5-(4.2)=0
We add all the numbers together, and all the variables
-v/5-4.2=0
We multiply all the terms by the denominator
-v-(4.2)*5=0
We add all the numbers together, and all the variables
-1v-21=0
We move all terms containing v to the left, all other terms to the right
-v=21
v=21/-1
v=-21
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