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x in (-oo:+oo)
y = (1.5*(3*x-2))/6 // - (1.5*(3*x-2))/6
y-((1.5*(3*x-2))/6) = 0
y-0.25*(3*x-2) = 0
y-0.25*(3*x-2) = 0
y-0.75*x+0.5 = 0
y-0.75*x+0.5 = 0
y-0.75*x+0.5 = 0 // - y+0.5
-0.75*x = -(y+0.5) // : -0.75
x = (-(y+0.5))/(-0.75)
x = 1.33333333*(y+0.5)
x = 1.33333333*(y+0.5)
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