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x in (-oo:+oo)
y-1 = (5/3)*(x-4) // - (5/3)*(x-4)
y-((5/3)*(x-4))-1 = 0
(-5/3)*(x-4)+y-1 = 0
y-5/3*(x-4)-1 = 0
y-5/3*(x-4)-1 = 0
y-5/3*x-1+20/3 = 0
y-5/3*x+17/3 = 0
y-5/3*x+17/3 = 0
y-5/3*x+17/3 = 0 // - y+17/3
-5/3*x = -(y+17/3) // : -5/3
x = (-(y+17/3))/(-5/3)
x = 3/5*(y+17/3)
x = 3/5*(y+17/3)
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