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

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


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

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

Reorder the terms:
3 + -3u = 21 + -6u

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

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

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

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

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

Combine like terms: 21 + -3 = 18
3u = 18

Divide each side by '3'.
u = 6

Simplifying
u = 6

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