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x in (-oo:+oo)
y+8 = (3/2)*(x-9) // - (3/2)*(x-9)
y-((3/2)*(x-9))+8 = 0
(-3/2)*(x-9)+y+8 = 0
y-3/2*(x-9)+8 = 0
y-3/2*(x-9)+8 = 0
y-3/2*x+8+27/2 = 0
y-3/2*x+43/2 = 0
y-3/2*x+43/2 = 0
y-3/2*x+43/2 = 0 // - y+43/2
-3/2*x = -(y+43/2) // : -3/2
x = (-(y+43/2))/(-3/2)
x = 2/3*(y+43/2)
x = 2/3*(y+43/2)
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