3[3u-6]=18

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Solution for 3[3u-6]=18 equation: 


Simplifying
3[3u + -6] = 18

Reorder the terms:
3[-6 + 3u] = 18
[-6 * 3 + 3u * 3] = 18
[-18 + 9u] = 18

Solving
-18 + 9u = 18

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + 9u = 18 + 18

Combine like terms: -18 + 18 = 0
0 + 9u = 18 + 18
9u = 18 + 18

Combine like terms: 18 + 18 = 36
9u = 36

Divide each side by '9'.
u = 4

Simplifying
u = 4

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