x+3=400

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Solution for x+3=400 equation: 


Simplifying
x + 3 = 400

Reorder the terms:
3 + x = 400

Solving
3 + x = 400

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 + -3 + x = 400 + -3

Combine like terms: 3 + -3 = 0
0 + x = 400 + -3
x = 400 + -3

Combine like terms: 400 + -3 = 397
x = 397

Simplifying
x = 397

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