300x=280+150x+3x
    5-6X=-2X+1
    d*d+4*d-1=0
    A*(A+18)=360
    1/d+1/(2d+1)=1/(d+1)
    1/d+1/(d+2)+1/(d+3)-1/(d+5)=0
    sqrt（x—6.25）+sqrt（x—0.25）=2
    23000=4600*（（（1-（1+i）^-9)/i)
    2 * x * ln ( x + 1 ) + ( x + 1 ) ^ -1 * x ^ 2 + 2 * ln ( x + 1 ) + 2 * ( x + 1 ) ^ -1 * x + ( x + 1 ) ^ -1 - 2 * x
    1/(2x*sqrt(1-2x^2))=10
    X+X*0.06=250000
    0.23x=x-673678.33+79530.21
    8^x-7^x=15
    2cosx=xsinx
    tanx=2/x
    2+x+2+x+2=10
    [sin(x+30)]/[(sinx)(sin70)]=(sin60)/[(sin20)(sin40)]
    [sin(x+30)]/[(sinx)(sin70)]=[sin60]/[(sin20)(sin40)]
    (sin(x+30))/(sinx)(sin70)=(sin(60))/(sin20)(sin40)
    X^2-0.25X-13/2=0

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