21=4v-15

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Solution for 21=4v-15 equation:


Simplifying
21 = 4v + -15

Reorder the terms:
21 = -15 + 4v

Solving
21 = -15 + 4v

Solving for variable 'v'.

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

Add '-4v' to each side of the equation.
21 + -4v = -15 + 4v + -4v

Combine like terms: 4v + -4v = 0
21 + -4v = -15 + 0
21 + -4v = -15

Add '-21' to each side of the equation.
21 + -21 + -4v = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -4v = -15 + -21
-4v = -15 + -21

Combine like terms: -15 + -21 = -36
-4v = -36

Divide each side by '-4'.
v = 9

Simplifying
v = 9

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