X-(-21)=40

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Solution for X-(-21)=40 equation: 


Simplifying
X + -1(-21) = 40

Multiply -1 * -21
X + 21 = 40

Reorder the terms:
21 + X = 40

Solving
21 + X = 40

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + X = 40 + -21

Combine like terms: 21 + -21 = 0
0 + X = 40 + -21
X = 40 + -21

Combine like terms: 40 + -21 = 19
X = 19

Simplifying
X = 19

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