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)
    x+2/7=3/4
    2.5=x/(x-75)
    2.5=x/x-75
    （a×a）+a=600
    4X+（X*0.3）=1540
    4X+（X*0.3）=154
    4X+（X*0.9）=154
    3√x^3
    x+2/x-3
    （X1+X2+X3）(X2*X4)(X1+X5+X6)

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