X+3+x=15

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Solution for X+3+x=15 equation:


Simplifying
X + 3 + x = 15

Reorder the terms:
3 + X + x = 15

Solving
3 + X + x = 15

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 = 15 + -3

Reorder the terms:
3 + -3 + X + x = 15 + -3

Combine like terms: 3 + -3 = 0
0 + X + x = 15 + -3
X + x = 15 + -3

Combine like terms: 15 + -3 = 12
X + x = 12

Add '-1x' to each side of the equation.
X + x + -1x = 12 + -1x

Combine like terms: x + -1x = 0
X + 0 = 12 + -1x
X = 12 + -1x

Simplifying
X = 12 + -1x

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