4+x²=（√5+1+x）²
    （40-x）＾0.75-0.324（x-30）=0
    0.165=（1+12*r）^（r/12）
    0.165=（1+r/12）^12r
    （1000+2000x）（1+x）=1320
    5.5X=5
    3^x=x^37
    3^x=x^3^7
    3^x=x^21
    3t2-24t+36=0
    3t2-24t+36=0
    3t2-24t+36=0
    3t2-24t+36=0
    3t2-24t+36=0
    3t2-24t+36=0
    5*sin(π/5)=3*sin(x)
    15/9*sin(π/5)=sin(x)
    sinx＝0.16118
    sinx＝0.2321
    6/x=-(2/3)x+20/3

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