12=3x+9y

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Solution for 12=3x+9y equation:


Simplifying
12 = 3x + 9y

Solving
12 = 3x + 9y

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.
12 + -3x = 3x + -3x + 9y

Combine like terms: 3x + -3x = 0
12 + -3x = 0 + 9y
12 + -3x = 9y

Add '-12' to each side of the equation.
12 + -12 + -3x = -12 + 9y

Combine like terms: 12 + -12 = 0
0 + -3x = -12 + 9y
-3x = -12 + 9y

Divide each side by '-3'.
x = 4 + -3y

Simplifying
x = 4 + -3y

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