lg(50-x)/x=-0.756
    lg(50-x)/x=0.766
    180-30-(40-x)+180-50-x=360-180-60
    (180-50-x)+(180-30-40-x)=240
    (180-50-x)+[180-30-(40-x)]=240
    x-45.47=456.19247460537
    1=9.3876-3826.36/(x-45.47)
    -3826.36/(x-45.47)=-9.3876
    3826.36/（x-45.47）=8.3876
    2300（1+x)²=3200
    x÷（x-16）=3
    x/6.4=2/64
    4x－x∧2＝1
    x^2+6x-40=0
    x^2+2x-20=0
    x=-6/（ln0.1+ln0.2+ln0.9+ln0.8+ln0.7+ln0.7）
    x^2+x=210
    2^x+4^13=8^9
    x^2023=x^2021
    （1+1/ x)∧x

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