-9u+15=3(u-7)

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Solution for -9u+15=3(u-7) equation:


Simplifying
-9u + 15 = 3(u + -7)

Reorder the terms:
15 + -9u = 3(u + -7)

Reorder the terms:
15 + -9u = 3(-7 + u)
15 + -9u = (-7 * 3 + u * 3)
15 + -9u = (-21 + 3u)

Solving
15 + -9u = -21 + 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.
15 + -9u + -3u = -21 + 3u + -3u

Combine like terms: -9u + -3u = -12u
15 + -12u = -21 + 3u + -3u

Combine like terms: 3u + -3u = 0
15 + -12u = -21 + 0
15 + -12u = -21

Add '-15' to each side of the equation.
15 + -15 + -12u = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -12u = -21 + -15
-12u = -21 + -15

Combine like terms: -21 + -15 = -36
-12u = -36

Divide each side by '-12'.
u = 3

Simplifying
u = 3

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