X-(-a)=-b

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Solution for X-(-a)=-b equation: 


Simplifying
X + -1(-1a) = -1b

Remove parenthesis around (-1a)
X + -1 * -1a = -1b

Multiply -1 * -1
X + 1a = -1b

Solving
X + 1a = -1b

Solving for variable 'X'.

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

Add '-1a' to each side of the equation.
X + 1a + -1a = -1a + -1b

Combine like terms: 1a + -1a = 0
X + 0 = -1a + -1b
X = -1a + -1b

Simplifying
X = -1a + -1b

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