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8100=81*25v
We move all terms to the left:
8100-(81*25v)=0
We add all the numbers together, and all the variables
-(+81*25v)+8100=0
We get rid of parentheses
-81*25v+8100=0
Wy multiply elements
-2025v+8100=0
We move all terms containing v to the left, all other terms to the right
-2025v=-8100
v=-8100/-2025
v=+4
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