9=6v+21

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Solution for 9=6v+21 equation: 


Simplifying
9 = 6v + 21

Reorder the terms:
9 = 21 + 6v

Solving
9 = 21 + 6v

Solving for variable 'v'.

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

Add '-6v' to each side of the equation.
9 + -6v = 21 + 6v + -6v

Combine like terms: 6v + -6v = 0
9 + -6v = 21 + 0
9 + -6v = 21

Add '-9' to each side of the equation.
9 + -9 + -6v = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -6v = 21 + -9
-6v = 21 + -9

Combine like terms: 21 + -9 = 12
-6v = 12

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

Simplifying
v = -2

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