9+3x=12-y

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Solution for 9+3x=12-y equation: 


Simplifying
9 + 3x = 12 + -1y

Solving
9 + 3x = 12 + -1y

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 12 + -9 + -1y

Combine like terms: 9 + -9 = 0
0 + 3x = 12 + -9 + -1y
3x = 12 + -9 + -1y

Combine like terms: 12 + -9 = 3
3x = 3 + -1y

Divide each side by '3'.
x = 1 + -0.3333333333y

Simplifying
x = 1 + -0.3333333333y

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