13=3x-y

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Solution for 13=3x-y equation:


Simplifying
13 = 3x + -1y

Solving
13 = 3x + -1y

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
13 + -3x = 3x + -3x + -1y

Combine like terms: 3x + -3x = 0
13 + -3x = 0 + -1y
13 + -3x = -1y

Add '-13' to each side of the equation.
13 + -13 + -3x = -13 + -1y

Combine like terms: 13 + -13 = 0
0 + -3x = -13 + -1y
-3x = -13 + -1y

Divide each side by '-3'.
x = 4.333333333 + 0.3333333333y

Simplifying
x = 4.333333333 + 0.3333333333y

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