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10(5+v)=40
We move all terms to the left:
10(5+v)-(40)=0
We add all the numbers together, and all the variables
10(v+5)-40=0
We multiply parentheses
10v+50-40=0
We add all the numbers together, and all the variables
10v+10=0
We move all terms containing v to the left, all other terms to the right
10v=-10
v=-10/10
v=-1
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