-3u+21=-6(u-1)

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Solution for -3u+21=-6(u-1) equation:


Simplifying
-3u + 21 = -6(u + -1)

Reorder the terms:
21 + -3u = -6(u + -1)

Reorder the terms:
21 + -3u = -6(-1 + u)
21 + -3u = (-1 * -6 + u * -6)
21 + -3u = (6 + -6u)

Solving
21 + -3u = 6 + -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.
21 + -3u + 6u = 6 + -6u + 6u

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

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

Add '-21' to each side of the equation.
21 + -21 + 3u = 6 + -21

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

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

Divide each side by '3'.
u = -5

Simplifying
u = -5

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