1/10+1.5/x=0.5/10
    x/（x+100）=90%
    x/（x+100）=99%
    5x=7x-18
    3X+12=9X
    m+√45+5m＝9
    2b+b²=24
    2（1+x）^=6.42
    5X+30-85=3X+85
    18x＝12（28－x）
    18x＝15（28－x）
    sin(x+π/4)
    arctan(x/10)+arctan(x/5)=90
    -1/3x + 1/3 = x^2 - 2x - 3
    -1/3 + 1/3 = x^2 - 2x - 3
    x-x*1%=11000
    arctan0.1x+arctan0.2x=45
    x^(-1/2)=(2-x)^(-1/2)+0.0965308*(x^(1/2)+(2-x)^(1/2))^(1/3)/((2-x)^(2))
    arctan0.1x+arctan0.2x=45
    x^(-1/2)=(2-x)^(-1/2)+0.096308*(x^(1/2)+(2-x)^(1/2))^(1/3)/(2-x)^(2)

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