3x+6=x+7
    1/d+1/(d+1)+1/(d+2)=1/(d+10)
    d^3+16.5*d^2+3*d+10=0
    X-0.3X+700=X+1/6X
    120X+232*（20407.81-X）=1514389.08
    120X+232*（20407.81-X）=669925.44
    21x^2-15x-2=0
    120X+232*（20407.81-X）=442425.44
    -78.975+84.5/（1+x/12*6）+0.325/（1+x/12*13）=0
    19x^2-54x-9=0
    -78.975+84.5/(1+（X/12*6)+0.325/(1+(x/12*13）=0
    120X*232*（20407.81-X）=442425.44
    x^2 - 58x + 351=0
    n*n+(-1/4*n)(-1/4*n)= 4
    n*n+(-1/4*n)^2=4
    x+(50/x)
    x^2-5.6x+7.6=0
    x²-3.5x-10=0
    a×0.6=14.2
    a×0.6=64

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