X+(-21)=(-3)

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Solution for X+(-21)=(-3) equation: 


Simplifying
X + (-21) = (-3)
X + -21 = (-3)

Reorder the terms:
-21 + X = (-3)
-21 + X = -3

Solving
-21 + X = -3

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 = -3 + 21

Combine like terms: -21 + 21 = 0
0 + X = -3 + 21
X = -3 + 21

Combine like terms: -3 + 21 = 18
X = 18

Simplifying
X = 18

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