4-(-x)=15

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Solution for 4-(-x)=15 equation: 


Simplifying
4 + -1(-1x) = 15

Remove parenthesis around (-1x)
4 + -1 * -1x = 15

Multiply -1 * -1
4 + 1x = 15

Solving
4 + 1x = 15

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + 1x = 15 + -4

Combine like terms: 4 + -4 = 0
0 + 1x = 15 + -4
1x = 15 + -4

Combine like terms: 15 + -4 = 11
1x = 11

Divide each side by '1'.
x = 11

Simplifying
x = 11

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