13=u-(-6)

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Solution for 13=u-(-6) equation:


Simplifying
13 = u + -1(-6)

Multiply -1 * -6
13 = u + 6

Reorder the terms:
13 = 6 + u

Solving
13 = 6 + 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 = 6 + u + -1u

Combine like terms: u + -1u = 0
13 + -1u = 6 + 0
13 + -1u = 6

Add '-13' to each side of the equation.
13 + -13 + -1u = 6 + -13

Combine like terms: 13 + -13 = 0
0 + -1u = 6 + -13
-1u = 6 + -13

Combine like terms: 6 + -13 = -7
-1u = -7

Divide each side by '-1'.
u = 7

Simplifying
u = 7

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