X+100=400

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Solution for X+100=400 equation: 


Simplifying
X + 100 = 400

Reorder the terms:
100 + X = 400

Solving
100 + X = 400

Solving for variable 'X'.

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

Add '-100' to each side of the equation.
100 + -100 + X = 400 + -100

Combine like terms: 100 + -100 = 0
0 + X = 400 + -100
X = 400 + -100

Combine like terms: 400 + -100 = 300
X = 300

Simplifying
X = 300

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