x+123=120

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Solution for x+123=120 equation: 


Simplifying
x + 123 = 120

Reorder the terms:
123 + x = 120

Solving
123 + x = 120

Solving for variable 'x'.

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

Add '-123' to each side of the equation.
123 + -123 + x = 120 + -123

Combine like terms: 123 + -123 = 0
0 + x = 120 + -123
x = 120 + -123

Combine like terms: 120 + -123 = -3
x = -3

Simplifying
x = -3

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