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x in (-oo:+oo)
x-((1/3)*(6*x+9*y))+2*y+3 = 0
(-1/3)*(6*x+9*y)+x+2*y+3 = 0
x-1/3*(6*x+9*y)+2*y+3 = 0
x-1/3*(6*x+9*y)+2*y+3 = 0
2*y-x-3*y+3 = 0
3-x-y = 0
3-x-y = 0
3-x-y = 0 // - 3-y
-x = -(3-y) // * -1
x = 3-y
x = 3-y
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