15=21-2v

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Solution for 15=21-2v equation:


Simplifying
15 = 21 + -2v

Solving
15 = 21 + -2v

Solving for variable 'v'.

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

Add '2v' to each side of the equation.
15 + 2v = 21 + -2v + 2v

Combine like terms: -2v + 2v = 0
15 + 2v = 21 + 0
15 + 2v = 21

Add '-15' to each side of the equation.
15 + -15 + 2v = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2v = 21 + -15
2v = 21 + -15

Combine like terms: 21 + -15 = 6
2v = 6

Divide each side by '2'.
v = 3

Simplifying
v = 3

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