2x-y=400

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Solution for 2x-y=400 equation: 


Simplifying
2x + -1y = 400

Solving
2x + -1y = 400

Solving for variable 'x'.

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

Add 'y' to each side of the equation.
2x + -1y + y = 400 + y

Combine like terms: -1y + y = 0
2x + 0 = 400 + y
2x = 400 + y

Divide each side by '2'.
x = 200 + 0.5y

Simplifying
x = 200 + 0.5y

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