3x-9y=13

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Solution for 3x-9y=13 equation: 


Simplifying
3x + -9y = 13

Solving
3x + -9y = 13

Solving for variable 'x'.

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

Add '9y' to each side of the equation.
3x + -9y + 9y = 13 + 9y

Combine like terms: -9y + 9y = 0
3x + 0 = 13 + 9y
3x = 13 + 9y

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

Simplifying
x = 4.333333333 + 3y

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