-6=-6u+3(u+7)

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Solution for -6=-6u+3(u+7) equation:


Simplifying
-6 = -6u + 3(u + 7)

Reorder the terms:
-6 = -6u + 3(7 + u)
-6 = -6u + (7 * 3 + u * 3)
-6 = -6u + (21 + 3u)

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

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

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

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

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

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

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

Divide each side by '3'.
u = 9

Simplifying
u = 9

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