123+X=420

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Solution for 123+X=420 equation: 


Simplifying
123 + X = 420

Solving
123 + X = 420

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 = 420 + -123

Combine like terms: 123 + -123 = 0
0 + X = 420 + -123
X = 420 + -123

Combine like terms: 420 + -123 = 297
X = 297

Simplifying
X = 297

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