9=u-3

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Solution for 9=u-3 equation:


Simplifying
9 = u + -3

Reorder the terms:
9 = -3 + u

Solving
9 = -3 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
9 + -1u = -3 + u + -1u

Combine like terms: u + -1u = 0
9 + -1u = -3 + 0
9 + -1u = -3

Add '-9' to each side of the equation.
9 + -9 + -1u = -3 + -9

Combine like terms: 9 + -9 = 0
0 + -1u = -3 + -9
-1u = -3 + -9

Combine like terms: -3 + -9 = -12
-1u = -12

Divide each side by '-1'.
u = 12

Simplifying
u = 12

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