2（x+2）－3x＜1
    -1<=1-x^2<=1
    3(2/5x+2)>=6-2(1-x)
    2(x+1)-3(1-x)<6
    -3（x+1）-（x-3）<8
    2x-3<1/2(x+2)
    80976/6.7*（1+0.0797)^n＞61453*（1+0.0159)^n
    600-60y+100y>=680
    1000-100y+150y<=1200
    0.5x-1≤0
    0.5x≤0
    3x+1＞x+3
    sinxsin7x>1/4
    -3x+6<=4-x
    x^2＜x
    -3x+16>=0
    -3x<1/3
    5-2x>=-1
    2x/7-（6-5x）/14＞3/2
    4x+2(7-x)>=25

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