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    x+1/(1-x)+x/x- 1=19/6
    (27-3x)x=90
    (27-3x)X=54
    (28-x)(10-x)=243
    4x(x-1)=16
    x^2(x-1)=16
    x(x-3)=54
    1653=80000*a*(1+a)
    1+x+x^2=1.96
    X+X^2=1.96
    X+X^2=69
    (80−2x)(12+2x)−16x=1156+640
    (80-2x)(12+2x)-16=1156+640
    x(x+10)=144
    5xx=4x
    (3x+1)(x-1)=(4x-1)(x-1)
    3×2^1-x=1×2^x-1
    3×2^x=1×2^-x
    1+x+x^2=31
    3X^2-6X-9=0

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