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x in (-oo:+oo)
x/4 <= -3/2 // + -3/2
x/4-(-3/2) <= 0
x/4+3/2 <= 0
1/4*x+3/2 <= 0 // - 3/2
1/4*x <= -3/2 // : 1/4
x <= -3/2/1/4
x <= -6
x in (-oo:-6>
(-oo:-6>
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