7u=10u-21

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Solution for 7u=10u-21 equation: 


Simplifying
7u = 10u + -21

Reorder the terms:
7u = -21 + 10u

Solving
7u = -21 + 10u

Solving for variable 'u'.

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

Add '-10u' to each side of the equation.
7u + -10u = -21 + 10u + -10u

Combine like terms: 7u + -10u = -3u
-3u = -21 + 10u + -10u

Combine like terms: 10u + -10u = 0
-3u = -21 + 0
-3u = -21

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

Simplifying
u = 7

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