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x in (-oo:+oo)
y = (3/4)*(x-3) // - (3/4)*(x-3)
y-((3/4)*(x-3)) = 0
(-3/4)*(x-3)+y = 0
y-3/4*(x-3) = 0
y-3/4*(x-3) = 0
y-3/4*x+9/4 = 0
y-3/4*x+9/4 = 0
y-3/4*x+9/4 = 0 // - y+9/4
-3/4*x = -(y+9/4) // : -3/4
x = (-(y+9/4))/(-3/4)
x = 4/3*(y+9/4)
x = 4/3*(y+9/4)
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