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

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


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

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

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

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

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

Combine like terms: 3u + -3u = 0
-21 + -12u = -9 + 0
-21 + -12u = -9

Add '21' to each side of the equation.
-21 + 21 + -12u = -9 + 21

Combine like terms: -21 + 21 = 0
0 + -12u = -9 + 21
-12u = -9 + 21

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

Divide each side by '-12'.
u = -1

Simplifying
u = -1

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