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v^2+12v+20=(v+10)(v+)
We move all terms to the left:
v^2+12v+20-((v+10)(v+))=0
We add all the numbers together, and all the variables
v^2+12v-((v+10)(+v))+20=0
We multiply parentheses ..
v^2-((+v^2+10v))+12v+20=0
We calculate terms in parentheses: -((+v^2+10v)), so:We add all the numbers together, and all the variables
(+v^2+10v)
We get rid of parentheses
v^2+10v
Back to the equation:
-(v^2+10v)
v^2+12v-(v^2+10v)+20=0
We get rid of parentheses
v^2-v^2+12v-10v+20=0
We add all the numbers together, and all the variables
2v+20=0
We move all terms containing v to the left, all other terms to the right
2v=-20
v=-20/2
v=-10
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