4-(-X)=21

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Solution for 4-(-X)=21 equation: 


Simplifying
4 + -1(-1X) = 21

Remove parenthesis around (-1X)
4 + -1 * -1X = 21

Multiply -1 * -1
4 + 1X = 21

Solving
4 + 1X = 21

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 = 21 + -4

Combine like terms: 4 + -4 = 0
0 + 1X = 21 + -4
1X = 21 + -4

Combine like terms: 21 + -4 = 17
1X = 17

Divide each side by '1'.
X = 17

Simplifying
X = 17

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