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x in (-oo:+oo)
y = (3/2)*x-(9/2) // - (3/2)*x-(9/2)
y-((3/2)*x)+9/2 = 0
(-3/2)*x+y+9/2 = 0
y-3/2*x+9/2 = 0 // - y+9/2
-3/2*x = -(y+9/2) // : -3/2
x = (-(y+9/2))/(-3/2)
x = 2/3*(y+9/2)
x = 2/3*(y+9/2)
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