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x in (-oo:+oo)
y-2 = (5/3)*(x-9)-(3*x) // - (5/3)*(x-9)-(3*x)
3*x-((5/3)*(x-9))+y-2 = 0
(-5/3)*(x-9)+3*x+y-2 = 0
3*x-5/3*(x-9)+y-2 = 0
3*x-5/3*(x-9)+y-2 = 0
4/3*x+y-2+15 = 0
4/3*x+y+13 = 0
4/3*x+y+13 = 0
4/3*x+y+13 = 0 // - y+13
4/3*x = -(y+13) // : 4/3
x = (-(y+13))/4/3
x = -3/4*(y+13)
x = -3/4*(y+13)
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