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