-40+X-X*8%/4-690≥
    -40+E-Ex8%/4-690≥
    1-x^2/2<0
    -x^2-2x+15<=0
    123.5x^(7/4)>x^2+2.5
    -x^2-2x+15<=0
    x^2-x-12<0
    x^2-6x+5<0
    5x-1＜3(x+1) (2x-1)/3-(5x+1)/2≤1
    1.5k^(7/4)≥k^2-k
    100x+150*(30-x)≥3900 100x+150*(30-x)≤4000
    (x-1)/7<(2x+5)/3
    2x+1≥5
    (2-x)(x+1)>0
    x²-3x<0
    (x-1)(2x+1)≤0
    2-x>1
    2x-1>0
    2-x>0
    2x-1>0

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