3v-9v=-21-3v

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Solution for 3v-9v=-21-3v equation: 


Simplifying
3v + -9v = -21 + -3v

Combine like terms: 3v + -9v = -6v
-6v = -21 + -3v

Solving
-6v = -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.
-6v + 3v = -21 + -3v + 3v

Combine like terms: -6v + 3v = -3v
-3v = -21 + -3v + 3v

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

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

Simplifying
v = 7

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