x+3y=400

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Solution for x+3y=400 equation: 


Simplifying
x + 3y = 400

Solving
x + 3y = 400

Solving for variable 'x'.

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

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

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

Simplifying
x = 400 + -3y

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