15-18=6u+9

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Solution for 15-18=6u+9 equation:


Simplifying
15 + -18 = 6u + 9

Combine like terms: 15 + -18 = -3
-3 = 6u + 9

Reorder the terms:
-3 = 9 + 6u

Solving
-3 = 9 + 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 + -6u = 9 + 6u + -6u

Combine like terms: 6u + -6u = 0
-3 + -6u = 9 + 0
-3 + -6u = 9

Add '3' to each side of the equation.
-3 + 3 + -6u = 9 + 3

Combine like terms: -3 + 3 = 0
0 + -6u = 9 + 3
-6u = 9 + 3

Combine like terms: 9 + 3 = 12
-6u = 12

Divide each side by '-6'.
u = -2

Simplifying
u = -2

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