-18=3(u+6)-7u

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Solution for -18=3(u+6)-7u equation:


Simplifying
-18 = 3(u + 6) + -7u

Reorder the terms:
-18 = 3(6 + u) + -7u
-18 = (6 * 3 + u * 3) + -7u
-18 = (18 + 3u) + -7u

Combine like terms: 3u + -7u = -4u
-18 = 18 + -4u

Solving
-18 = 18 + -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
-18 + 4u = 18 + -4u + 4u

Combine like terms: -4u + 4u = 0
-18 + 4u = 18 + 0
-18 + 4u = 18

Add '18' to each side of the equation.
-18 + 18 + 4u = 18 + 18

Combine like terms: -18 + 18 = 0
0 + 4u = 18 + 18
4u = 18 + 18

Combine like terms: 18 + 18 = 36
4u = 36

Divide each side by '4'.
u = 9

Simplifying
u = 9

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