-9(u-5)=3u+21

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Solution for -9(u-5)=3u+21 equation:


Simplifying
-9(u + -5) = 3u + 21

Reorder the terms:
-9(-5 + u) = 3u + 21
(-5 * -9 + u * -9) = 3u + 21
(45 + -9u) = 3u + 21

Reorder the terms:
45 + -9u = 21 + 3u

Solving
45 + -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.
45 + -9u + -3u = 21 + 3u + -3u

Combine like terms: -9u + -3u = -12u
45 + -12u = 21 + 3u + -3u

Combine like terms: 3u + -3u = 0
45 + -12u = 21 + 0
45 + -12u = 21

Add '-45' to each side of the equation.
45 + -45 + -12u = 21 + -45

Combine like terms: 45 + -45 = 0
0 + -12u = 21 + -45
-12u = 21 + -45

Combine like terms: 21 + -45 = -24
-12u = -24

Divide each side by '-12'.
u = 2

Simplifying
u = 2

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