3x-y=31

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Solution for 3x-y=31 equation: 


Simplifying
3x + -1y = 31

Solving
3x + -1y = 31

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.
3x + -1y + y = 31 + y

Combine like terms: -1y + y = 0
3x + 0 = 31 + y
3x = 31 + y

Divide each side by '3'.
x = 10.33333333 + 0.3333333333y

Simplifying
x = 10.33333333 + 0.3333333333y

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