10u-21=7u

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Solution for 10u-21=7u equation:


Simplifying
10u + -21 = 7u

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

Solving
-21 + 10u = 7u

Solving for variable 'u'.

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

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

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

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

Add '21' to each side of the equation.
-21 + 21 + 3u = 0 + 21

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

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

Divide each side by '3'.
u = 7

Simplifying
u = 7

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