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