x+2=4
    5x—2=7x+8
    5x-2=7x+8
    3/4y-1-1=5/6y-7
    x-0.07/x-0.09=2.79
     20%-15%-((1+x)/x)×10%×40%=0
    X*0.03=X-3793.20
    X*0.03=X-4321
    0.94 = （0.021*x^1.85+210.125）^0.5*x^0.84
     0.94 = （0.021*L^1.85+210.125）^0.5*L^0.84
    0.94=（0.021*L^1.85+201.7）^0.5*L^0.84
    3x＋7(12-x)＝61
    （26.293+x）×2.75＝26.293+70.778-x
    x-x*5%=1680000
    √3x=6-3x
    x^2+1.4x-0.14=0
    （26.293+x）×2.65＝26.293+70.778-x
    0.134/x＝0.1289/0.86289
    0.4/100.58＝x/33.7
    ln(1-x/x)

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