4-x/x+2≥0
    (4-x)/(x+2)≥0
    x(x－2)＞0
    x^2－4x+3≤0
    x^2－x＞0
    5+m＜0
    10x-5(20-x)>=80
    8x+8>8x-8(x+8)
    8x+8<8(8x+8)-(x-8)
    8x-8<8(8x+8)-(x-8)
    8x-8<8(8x-8)-(x-8)
    8x-8(x-8)<8(8x-8)-(x-8)
    8x-8(x-8)<8(8x-8)+(x-8)
    8x-8(x-8)<8(8x+8)+(x-8)
    8x-8(x+8)<8(8x+8)+(x-8)
    8x+8(x+8)<8(8x+8)+(x-8)
    8(8x+8)+8(8x+8)<8x
    8(8x+8)+8(8x-8)<8x
    8(8x+8)-8(8x-8)<8x
    8(x-8)-8(8x-8)<8x

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