7u-21=3u+15

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Solution for 7u-21=3u+15 equation:


Simplifying
7u + -21 = 3u + 15

Reorder the terms:
-21 + 7u = 3u + 15

Reorder the terms:
-21 + 7u = 15 + 3u

Solving
-21 + 7u = 15 + 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
-21 + 7u + -3u = 15 + 3u + -3u

Combine like terms: 7u + -3u = 4u
-21 + 4u = 15 + 3u + -3u

Combine like terms: 3u + -3u = 0
-21 + 4u = 15 + 0
-21 + 4u = 15

Add '21' to each side of the equation.
-21 + 21 + 4u = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 4u = 15 + 21
4u = 15 + 21

Combine like terms: 15 + 21 = 36
4u = 36

Divide each side by '4'.
u = 9

Simplifying
u = 9

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