4x-3<6x+3
    0.2x+0.4(50-x)＞16
    0.6x+0.9（50-x）≤40
    -11200+a-a*10%≥100
    2x+5<4x-2
    2x^2-3x-4≤0
    5(x-1)≤3(x+1)
    x×8-x≥30
    x×16-x÷2≥30
    2x+x2x+x52x+x2xx1x+1x+1x1+x>x5x5x5555
    sinx+cosx>tan(x+1)
    sinx+cosx>5tan(x+1)
    50^2+x^2-2*50*x*cos(180-arcsin((50*sin50)/x-50))>(x+15)^2
    20^2+x^2-2*50*x*cos(180-arcsin((50*sin50)/x-50))>(x+15)^2
    x+3/5<2x-5/3-1
    3（x+3）<5(2x-5)-1
    3（x+3）<5(2x-5)-15
    2+x^2>0
    2+x^2>0
    -2＜a∧2+2a-3＜-1

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