(x - 6)/5≤（x + 3） /2 -1
    （x + 5）/ 2 - 1 < (3x + 2)/2
    30(1-10%)(50-y)+40y≤1500
    -x^2+x+1<0
    x^2+x+1<0
    x^2+x+1>0
    100-x＜200-3x 100-x＜160-2x 160-2x＜200-3x
    100-x＜200-3x 100-x＜160-2x
    100-x＜200-3x
    10-x<25-3x
    10-x<15-2x<25-3x
    100-x<160-2x<200-3x
    100-x<160-2x
    2x^2+3x-12＜0
    5x^2 > 9
    x≥-x
    x≥0
    2-x≥x
    x(x-1)≥x
    4x^2+1600-800x/3＞0

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