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x in (-oo:+oo)
4*(-x/4) >= (5*x)/3-(1/6) // - (5*x)/3-(1/6)
4*(-x/4)-((5*x)/3)+1/6 >= 0
4*(-x/4)+(-5/3)*x+1/6 >= 0
1/6-8/3*x >= 0 // - 1/6
-8/3*x >= -1/6 // : -8/3
x <= -1/6/(-8/3)
x <= 1/16
x in (-oo:1/16>
(-oo:1/16>
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