Solve for v
v=13
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v-4=9
Square both sides of the equation.
v-4-\left(-4\right)=9-\left(-4\right)
Add 4 to both sides of the equation.
v=9-\left(-4\right)
Subtracting -4 from itself leaves 0.
v=13
Subtract -4 from 9.
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