-3x+y=15

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Solution for -3x+y=15 equation: 


Simplifying
-3x + y = 15

Solving
-3x + y = 15

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 = 15 + -1y

Combine like terms: y + -1y = 0
-3x + 0 = 15 + -1y
-3x = 15 + -1y

Divide each side by '-3'.
x = -5 + 0.3333333333y

Simplifying
x = -5 + 0.3333333333y

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