76.14=（（0.021*x^1.85+47.8）^0.5）*x^0.84
    x^2+5x-12
    （4802532+x）/（6662942+x）=0.73
    （4802532+x）/（6662942+x）=73
    0.5X-X/0.2/12.5=100000
    2B=36-3B
    786*42+X*143=150582
    （27.776+x）×2.95＝55.552+77.128-x
    （27.776+x）×2.75＝55.552+77.128-x
    （27.776+x）×2.55＝55.552+77.128-x
    （27.776+x）×2.35＝55.552+77.128-x
    （27.776+x）×2.15＝55.552+77.128-x
    79x+90(1-x)=83
    6X*0.5+3X*0.5=9
    3x^2+10x-65=0
    x^2+10x-65=0
    x^2=0.00003375*（0.1-x）
    2/(x-2)+2
    （5.8-5.8/1.13*0.13+0.13）/6.86=X
    （7-7/1.13*0.13+0.15）/6.86=X

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