15-2=13-u

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Solution for 15-2=13-u equation:


Simplifying
15 + -2 = 13 + -1u

Combine like terms: 15 + -2 = 13
13 = 13 + -1u

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

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

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

Solving
0 = -1u

Solving for variable 'u'.

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

Add 'u' to each side of the equation.
0 + u = -1u + u
Remove the zero:
u = -1u + u

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

Simplifying
u = 0

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