4=u-9

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Solution for 4=u-9 equation:


Simplifying
4 = u + -9

Reorder the terms:
4 = -9 + u

Solving
4 = -9 + 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.
4 + -1u = -9 + u + -1u

Combine like terms: u + -1u = 0
4 + -1u = -9 + 0
4 + -1u = -9

Add '-4' to each side of the equation.
4 + -4 + -1u = -9 + -4

Combine like terms: 4 + -4 = 0
0 + -1u = -9 + -4
-1u = -9 + -4

Combine like terms: -9 + -4 = -13
-1u = -13

Divide each side by '-1'.
u = 13

Simplifying
u = 13

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