1-a≤-2
    -1-a≤-2
    2x+5＞1
    （2x+1）/3＞x-1
    x+2≤4（x-1）
    2x＜5
    3x+1＞0
    4x-3≤5x
    2x＞-6
    x+1≥2
    （3x-1）/2≥2x+1
    x+5≤0
    x<=48-x
    3x+5(48-x)<=200
    1.5x+3.5(80-x)<=212
    5x+2.5(80-x)<=290
    x+2(10-x)>=13
    4x+2(10-x)>=30
    5x+2(10-x)>=30
    (0.7)^x<10^(-6)

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