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x in (-oo:+oo)
y-1 = (3/4)*(x-5) // - (3/4)*(x-5)
y-((3/4)*(x-5))-1 = 0
(-3/4)*(x-5)+y-1 = 0
y-3/4*(x-5)-1 = 0
y-3/4*(x-5)-1 = 0
y-3/4*x-1+15/4 = 0
y-3/4*x+11/4 = 0
y-3/4*x+11/4 = 0
y-3/4*x+11/4 = 0 // - y+11/4
-3/4*x = -(y+11/4) // : -3/4
x = (-(y+11/4))/(-3/4)
x = 4/3*(y+11/4)
x = 4/3*(y+11/4)
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