21-v=-3(v-3)

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Solution for 21-v=-3(v-3) equation:


Simplifying
21 + -1v = -3(v + -3)

Reorder the terms:
21 + -1v = -3(-3 + v)
21 + -1v = (-3 * -3 + v * -3)
21 + -1v = (9 + -3v)

Solving
21 + -1v = 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 + -1v + 3v = 9 + -3v + 3v

Combine like terms: -1v + 3v = 2v
21 + 2v = 9 + -3v + 3v

Combine like terms: -3v + 3v = 0
21 + 2v = 9 + 0
21 + 2v = 9

Add '-21' to each side of the equation.
21 + -21 + 2v = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 2v = 9 + -21
2v = 9 + -21

Combine like terms: 9 + -21 = -12
2v = -12

Divide each side by '2'.
v = -6

Simplifying
v = -6

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