9=u-4

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Solution for 9=u-4 equation:


Simplifying
9 = u + -4

Reorder the terms:
9 = -4 + u

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

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

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

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

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

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

Simplifying
u = 13

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