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x in (-oo:+oo)
y-1 = (3/4)*(x-1) // - (3/4)*(x-1)
y-((3/4)*(x-1))-1 = 0
(-3/4)*(x-1)+y-1 = 0
y-3/4*(x-1)-1 = 0
y-3/4*(x-1)-1 = 0
y-3/4*x-1+3/4 = 0
y-3/4*x-1/4 = 0
y-3/4*x-1/4 = 0
y-3/4*x-1/4 = 0 // - y-1/4
-3/4*x = -(y-1/4) // : -3/4
x = (-(y-1/4))/(-3/4)
x = -4/3*(1/4-y)
x = -4/3*(1/4-y)
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