x＝3
    93.6x*20-6.4x*30=16800
    （x+2）x13-4=Xx15+2
    （x+2）x13-4=Xx15+2
    0.17=0.137*a^-3+0.119*a-2+0.269*a-1-0.019
    0.17=0.137a^-3+0.119^-2+0.269a^-1-0.019
    0.17=0.137a^-3+0.119^-2+0.269a^-1-0.019
    0.12=0.137a^-3+0.119^-2+0.269a^-1-0.019
    0.12=0.137a^-3+0.119^-2+0.269a^-1-0.019
    0.43=0.137a^-3+0.119^-2+0.269a^-1-0.019
    5.5×8.99+12.19x=（5.5+x）×9.92
    （3-x）（3-x）+（3/2x+6.5-2）（3/2x+6.5-2）=√13
    x²-x=sqrt(3)
    10x^2+23x+12=0
    5.5×8.99+12.18x=（5.5+x）×9.92
    X÷0.1496+300000=X
    5.5×8.98+12.18x=（5.5+x）×9.93
    n^2+n=208
    (341.5)/31*x+136.5/31*(x+15)+93/31(x+30)=1025
    -1.2sin2x+0.8cosx=0.8

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