Solve for v
v=3
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-7v-9+10v=0
Add 10v to both sides.
3v-9=0
Combine -7v and 10v to get 3v.
3v=9
Add 9 to both sides. Anything plus zero gives itself.
v=\frac{9}{3}
Divide both sides by 3.
v=3
Divide 9 by 3 to get 3.
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