X+3=21

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Solution for X+3=21 equation: 


Simplifying
X + 3 = 21

Reorder the terms:
3 + X = 21

Solving
3 + X = 21

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + -3 + X = 21 + -3

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

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

Simplifying
X = 18

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