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9(9+v)=90
We move all terms to the left:
9(9+v)-(90)=0
We add all the numbers together, and all the variables
9(v+9)-90=0
We multiply parentheses
9v+81-90=0
We add all the numbers together, and all the variables
9v-9=0
We move all terms containing v to the left, all other terms to the right
9v=9
v=9/9
v=1
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