21=3v-9

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Solution for 21=3v-9 equation:


Simplifying
21 = 3v + -9

Reorder the terms:
21 = -9 + 3v

Solving
21 = -9 + 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 = -9 + 3v + -3v

Combine like terms: 3v + -3v = 0
21 + -3v = -9 + 0
21 + -3v = -9

Add '-21' to each side of the equation.
21 + -21 + -3v = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -3v = -9 + -21
-3v = -9 + -21

Combine like terms: -9 + -21 = -30
-3v = -30

Divide each side by '-3'.
v = 10

Simplifying
v = 10

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