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
    4x^2+1872-312x＞0
    4x^2-288x+1728＞0
    2<(3-2t)-(1.5t + 5) ≤ 4
    -3x>5
    9.9*1000y-(7×1000y)-(20-y)×7×1000 >0
    9.9*1000y-(7×1000y)-(20-y)×7×1000 >= 1
    24 * k - k ^ 2 > 42

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