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x in (-oo:+oo)
Y+1 = (-1/3)*(x-5) // - (-1/3)*(x-5)
Y-((-1/3)*(x-5))+1 = 0
(1/3)*(x-5)+Y+1 = 0
1/3*(x-5)+Y+1 = 0
1/3*(x-5)+Y+1 = 0
Y+1/3*x-5/3+1 = 0
Y+1/3*x-2/3 = 0
Y+1/3*x-2/3 = 0
Y+1/3*x-2/3 = 0 // - Y-2/3
1/3*x = -(Y-2/3) // : 1/3
x = (-(Y-2/3))/1/3
x = 3*(2/3-Y)
x = 3*(2/3-Y)
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