4x^2+6x>7
    10x-1>3x^2
    -3x^2-14x>9
    4x^2-21>-5x
    4x^2-42x+54>0
    -4x+12>5x^2
    12x^2>3x+15
    -6x^2>41x+63
    -2x^2-5x-2>0
    -4x^2-48>-32x
    0>8x^2+26x+15
    0>-5x^2+18x+35
    -24>-x^2+2x
    x乘以x-6小于0
    x+5大于等于2
    4x-1大于7
    4x+28-8（x-28）大于等于
    4x+28-8（x-28）大于1
    4x+28-8（x-28）大于28
    4x+28-8（x-28）大于等于1

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