15=12v-7v

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Solution for 15=12v-7v equation: 


Simplifying
15 = 12v + -7v

Combine like terms: 12v + -7v = 5v
15 = 5v

Solving
15 = 5v

Solving for variable 'v'.

Move all terms containing v to the left, all other terms to the right.

Add '-5v' to each side of the equation.
15 + -5v = 5v + -5v

Combine like terms: 5v + -5v = 0
15 + -5v = 0

Add '-15' to each side of the equation.
15 + -15 + -5v = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -5v = 0 + -15
-5v = 0 + -15

Combine like terms: 0 + -15 = -15
-5v = -15

Divide each side by '-5'.
v = 3

Simplifying
v = 3

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