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x in (-oo:+oo)
y-1 = (3/4)*(x-4) // - (3/4)*(x-4)
y-((3/4)*(x-4))-1 = 0
(-3/4)*(x-4)+y-1 = 0
y-3/4*(x-4)-1 = 0
y-3/4*(x-4)-1 = 0
y-3/4*x-1+3 = 0
y-3/4*x+2 = 0
y-3/4*x+2 = 0
y-3/4*x+2 = 0 // - y+2
-3/4*x = -(y+2) // : -3/4
x = (-(y+2))/(-3/4)
x = 4/3*(y+2)
x = 4/3*(y+2)
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