13=30-u

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Solution for 13=30-u equation:


Simplifying
13 = 30 + -1u

Solving
13 = 30 + -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.
13 + u = 30 + -1u + u

Combine like terms: -1u + u = 0
13 + u = 30 + 0
13 + u = 30

Add '-13' to each side of the equation.
13 + -13 + u = 30 + -13

Combine like terms: 13 + -13 = 0
0 + u = 30 + -13
u = 30 + -13

Combine like terms: 30 + -13 = 17
u = 17

Simplifying
u = 17

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