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x in (-oo:+oo)
y = 18*(1/4)*x*y+3 // - 18*(1/4)*x*y+3
y-(18*(1/4)*x*y)-3 = 0
y+(-9/2)*x*y-3 = 0
y-9/2*x*y-3 = 0 // - y-3
-9/2*x*y = -(y-3) // : -9/2*y
x = (-(y-3))/(-9/2*y)
x = -2/9*y^-1*(3-y)
x = -2/9*y^-1*(3-y)
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