400=x+2x

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Solution for 400=x+2x equation:


Simplifying
400 = x + 2x

Combine like terms: x + 2x = 3x
400 = 3x

Solving
400 = 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
400 + -3x = 3x + -3x

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

Add '-400' to each side of the equation.
400 + -400 + -3x = 0 + -400

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

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

Divide each side by '-3'.
x = 133.3333333

Simplifying
x = 133.3333333

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