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