-15=u+(-5)

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Solution for -15=u+(-5) equation:


Simplifying
-15 = u + (-5)
-15 = u + -5

Reorder the terms:
-15 = -5 + u

Solving
-15 = -5 + 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.
-15 + -1u = -5 + u + -1u

Combine like terms: u + -1u = 0
-15 + -1u = -5 + 0
-15 + -1u = -5

Add '15' to each side of the equation.
-15 + 15 + -1u = -5 + 15

Combine like terms: -15 + 15 = 0
0 + -1u = -5 + 15
-1u = -5 + 15

Combine like terms: -5 + 15 = 10
-1u = 10

Divide each side by '-1'.
u = -10

Simplifying
u = -10

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