3u+7v=21

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Solution for 3u+7v=21 equation: 


Simplifying
3u + 7v = 21

Solving
3u + 7v = 21

Solving for variable 'u'.

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

Add '-7v' to each side of the equation.
3u + 7v + -7v = 21 + -7v

Combine like terms: 7v + -7v = 0
3u + 0 = 21 + -7v
3u = 21 + -7v

Divide each side by '3'.
u = 7 + -2.333333333v

Simplifying
u = 7 + -2.333333333v

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