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

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


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

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

Combine like terms: 3u + 3u = 6u
-15 = 21 + 6u

Solving
-15 = 21 + 6u

Solving for variable 'u'.

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

Add '-6u' to each side of the equation.
-15 + -6u = 21 + 6u + -6u

Combine like terms: 6u + -6u = 0
-15 + -6u = 21 + 0
-15 + -6u = 21

Add '15' to each side of the equation.
-15 + 15 + -6u = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -6u = 21 + 15
-6u = 21 + 15

Combine like terms: 21 + 15 = 36
-6u = 36

Divide each side by '-6'.
u = -6

Simplifying
u = -6

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