13=u-4

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Solution for 13=u-4 equation:


Simplifying
13 = u + -4

Reorder the terms:
13 = -4 + u

Solving
13 = -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.
13 + -1u = -4 + u + -1u

Combine like terms: u + -1u = 0
13 + -1u = -4 + 0
13 + -1u = -4

Add '-13' to each side of the equation.
13 + -13 + -1u = -4 + -13

Combine like terms: 13 + -13 = 0
0 + -1u = -4 + -13
-1u = -4 + -13

Combine like terms: -4 + -13 = -17
-1u = -17

Divide each side by '-1'.
u = 17

Simplifying
u = 17

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