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    ½(6+b)4=30
    x∧3=-2
    200*(x+10)-300x=1200
    x=22*18
    x+4+x=40
    15*25=x
    x=15x25
    72X=36(60-x )
    4x+xx=9
    3/4+x=x/3
    y减5=2y-5
    (1+x^2)×(((-6x)/(x^2+2))^2-4×3/(x^2+2))=9/2
    1.1786*x*x+1.786*x-1.9646=0
    8.89*10^-17=(27x^3)(0.457+x)
    2*x^2+6*e^(-x)-4=0
    32.5(1-x)/65=0.4/2
    1+2x^3-3x^2=0
    90-x÷2+x
    (x+2)*(x+7)=(x+3)*(x+6)
    60-10t+6t=2*10t

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