51x+2xx>1500 x>0
    0-4y≤－3
    （2x＋3）÷3-1＜x-2
    2x＋3≤x＋11
    x-2（x-1)≥1
    2x＋4＞0
    (2x+1)/3-(1-x)/2<1
    4x<(x-7)/2
    2x-4>3(x-2)
    -3<=(3x-2)/4<1
    3x-4<3
    1-x>4
    (3x+2)/4-(7x-3)/8>2
    10-4*(x-3)>=2(x-1)
    3*(x+1)>=2*(x-1)
    5x+2<=7x+20
    3*x*ln(3/x^2)<2
    (x+5)(x-6)≤0
    5x-4≤6
    0<1/x<2

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