2.82988×（45-x）^0.75=x-37.5
    688.66-10.5×33.22-5.5x
    （（3215-X）/（X-993））*100=0.8
    （（3208-X）/（X-1075））*100=0.8
    （（3208-X）/X）*100=0.8
    38.441+1.758=33.22+0.5×(240.308+22.62x)×x
    （39.402+x）×0.85＝39.402+68.604-x
    （39.402+x）×0.85＝39.402+69.604-x
    （39.402+x）×0.85＝39.402+70.604-x
    （39.402+x）×0.85＝39.402+71.604-x
    （39.402+x）×0.85＝39.402+72.604-x
    32-√（25∧2-24∧2+48x-x∧2）=√（15∧2-x∧2）
    （2136+x）*0.6=3937+x
    138x^2-120060x+14500000=0
    10000/（x+101*0.12）+40000/x＝350
    0.025×ln((10^9)×k)＋k×500＝1
    143x²-131560x+21600000＝0
    0.025×ln((10^9)×k)＋k＝1
    x^2+((2+√3)^2)×(x^2)=8
    x*x/（1-x）=0.004

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