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x in (-oo:+oo)
Y-5 = (2/5)*(x-2) // - (2/5)*(x-2)
Y-((2/5)*(x-2))-5 = 0
(-2/5)*(x-2)+Y-5 = 0
Y-2/5*(x-2)-5 = 0
Y-2/5*(x-2)-5 = 0
Y-2/5*x-5+4/5 = 0
Y-2/5*x-21/5 = 0
Y-2/5*x-21/5 = 0
Y-2/5*x-21/5 = 0 // - Y-21/5
-2/5*x = -(Y-21/5) // : -2/5
x = (-(Y-21/5))/(-2/5)
x = -5/2*(21/5-Y)
x = -5/2*(21/5-Y)
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