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x in (-oo:+oo)
y+3 = (5/2)*(x-1) // - (5/2)*(x-1)
y-((5/2)*(x-1))+3 = 0
(-5/2)*(x-1)+y+3 = 0
y-5/2*(x-1)+3 = 0
y-5/2*(x-1)+3 = 0
y-5/2*x+5/2+3 = 0
y-5/2*x+11/2 = 0
y-5/2*x+11/2 = 0
y-5/2*x+11/2 = 0 // - y+11/2
-5/2*x = -(y+11/2) // : -5/2
x = (-(y+11/2))/(-5/2)
x = 2/5*(y+11/2)
x = 2/5*(y+11/2)
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