3(u+7)=7u-15

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Solution for 3(u+7)=7u-15 equation:


Simplifying
3(u + 7) = 7u + -15

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

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

Solving
21 + 3u = -15 + 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 + 3u + -7u = -15 + 7u + -7u

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

Combine like terms: 7u + -7u = 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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