X+x+3=21

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Solution for X+x+3=21 equation: 


Simplifying
X + x + 3 = 21

Reorder the terms:
3 + X + x = 21

Solving
3 + X + 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 + X + -3 + x = 21 + -3

Reorder the terms:
3 + -3 + X + x = 21 + -3

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

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

Add '-1x' to each side of the equation.
X + x + -1x = 18 + -1x

Combine like terms: x + -1x = 0
X + 0 = 18 + -1x
X = 18 + -1x

Simplifying
X = 18 + -1x

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