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x in (-oo:+oo)
Y-4 = (2/5)*(x-1) // - (2/5)*(x-1)
Y-((2/5)*(x-1))-4 = 0
(-2/5)*(x-1)+Y-4 = 0
Y-2/5*(x-1)-4 = 0
Y-2/5*(x-1)-4 = 0
Y-2/5*x-4+2/5 = 0
Y-2/5*x-18/5 = 0
Y-2/5*x-18/5 = 0
Y-2/5*x-18/5 = 0 // - Y-18/5
-2/5*x = -(Y-18/5) // : -2/5
x = (-(Y-18/5))/(-2/5)
x = -5/2*(18/5-Y)
x = -5/2*(18/5-Y)
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