21=4v-v

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Solution for 21=4v-v equation:


Simplifying
21 = 4v + -1v

Combine like terms: 4v + -1v = 3v
21 = 3v

Solving
21 = 3v

Solving for variable 'v'.

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

Add '-3v' to each side of the equation.
21 + -3v = 3v + -3v

Combine like terms: 3v + -3v = 0
21 + -3v = 0

Add '-21' to each side of the equation.
21 + -21 + -3v = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3v = 0 + -21
-3v = 0 + -21

Combine like terms: 0 + -21 = -21
-3v = -21

Divide each side by '-3'.
v = 7

Simplifying
v = 7

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