3v=21-4v

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Solution for 3v=21-4v equation: 


Simplifying
3v = 21 + -4v

Solving
3v = 21 + -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.
3v + 4v = 21 + -4v + 4v

Combine like terms: 3v + 4v = 7v
7v = 21 + -4v + 4v

Combine like terms: -4v + 4v = 0
7v = 21 + 0
7v = 21

Divide each side by '7'.
v = 3

Simplifying
v = 3

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