-3x-4y=9

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Solution for -3x-4y=9 equation: 


Simplifying
-3x + -4y = 9

Solving
-3x + -4y = 9

Solving for variable 'x'.

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

Add '4y' to each side of the equation.
-3x + -4y + 4y = 9 + 4y

Combine like terms: -4y + 4y = 0
-3x + 0 = 9 + 4y
-3x = 9 + 4y

Divide each side by '-3'.
x = -3 + -1.333333333y

Simplifying
x = -3 + -1.333333333y

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