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    (1-cos(π-x))/sin(π-x)=(2+6*(π-x)/π)/7
    (40-x)(20+2x)=1050
    (40-x)(20+x)=1050
    5.5x=20
    8*sqrt(5)*x+5*x*x=2
    10*sqrt(15)*x+5*x*x=2
    x^2-x-0.5=0
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x)/π)/7
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x)/π)/7
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x)/π)/7
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x))/7
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x))/7
    (1-cos(π-x))/sin(π-x)=(2+6(π-x))/7
    (1-cosx)/sinx=(2+6x/3.1415926)/7
    x(44-2x)=192
    (52-x)^(1.12-x)=57
    6290.3×π×0.0046×(50-x)=178.34×0.32738×(x-38)
    (57-x)^(1.12-x)=57
    (-4/9)x^2+(8/3)x+2=0
    162x=1/x+11.9

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