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

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


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

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

Reorder the terms:
21 + -9u = -3(9 + u)
21 + -9u = (9 * -3 + u * -3)
21 + -9u = (-27 + -3u)

Solving
21 + -9u = -27 + -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 + -9u + 3u = -27 + -3u + 3u

Combine like terms: -9u + 3u = -6u
21 + -6u = -27 + -3u + 3u

Combine like terms: -3u + 3u = 0
21 + -6u = -27 + 0
21 + -6u = -27

Add '-21' to each side of the equation.
21 + -21 + -6u = -27 + -21

Combine like terms: 21 + -21 = 0
0 + -6u = -27 + -21
-6u = -27 + -21

Combine like terms: -27 + -21 = -48
-6u = -48

Divide each side by '-6'.
u = 8

Simplifying
u = 8

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