-x/2-3x/2>=8
    -4x/2>=8
    3x/2+6>=2-x/2
    3x^2-7x<=10 x^2-x+1/4>0 -2x^2+x-4<=-3 x^2-3x+4>0
    3x^2-7x<=10
    0≦e^x-e(-x)+1/ex
    4x²≥4x-1
    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)

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