3x+y=900

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Solution for 3x+y=900 equation: 


Simplifying
3x + y = 900

Solving
3x + y = 900

Solving for variable 'x'.

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

Add '-1y' to each side of the equation.
3x + y + -1y = 900 + -1y

Combine like terms: y + -1y = 0
3x + 0 = 900 + -1y
3x = 900 + -1y

Divide each side by '3'.
x = 300 + -0.3333333333y

Simplifying
x = 300 + -0.3333333333y

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