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x in (-oo:+oo)
Y+1 = (3/4)*(x-6) // - (3/4)*(x-6)
Y-((3/4)*(x-6))+1 = 0
(-3/4)*(x-6)+Y+1 = 0
Y-3/4*(x-6)+1 = 0
Y-3/4*(x-6)+1 = 0
Y-3/4*x+1+9/2 = 0
Y-3/4*x+11/2 = 0
Y-3/4*x+11/2 = 0
Y-3/4*x+11/2 = 0 // - Y+11/2
-3/4*x = -(Y+11/2) // : -3/4
x = (-(Y+11/2))/(-3/4)
x = 4/3*(Y+11/2)
x = 4/3*(Y+11/2)
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