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

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


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

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

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

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

Combine like terms: -3u + 3u = 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 = 24
3u = 24

Divide each side by '3'.
u = 8

Simplifying
u = 8

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