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    1260/(1.5m)=1200/m-6
    15x+20(170-x)=3000
    -2x^2+4x+5
    150-(40-x)+130-x+120=360
    (3x/(x+3))+(1/x)=3
    (3x/x+3)+(1/x)=3
    x^2=x+60
    3x/x+3+1/x=3
    3x^2+x+3=x(x+3)
    3x^2+x+3=3
    a∧5=8
    (140-100-a)(300-2a)=1200
    x×x+x(x+7)=36
    (429.193-427.293)*(y-600)/(667.79-600)+427.293=
    1/2x^2-4x+7=1/2x
    2.78x÷(x+1400)=230
    (1+(2.78(x+187))/(x+1587))/(1+(2.78x)/(x+1400))=1.12
    (1+(2.78*(x+187))/(x+1587))/(1+(2.78*x)/(x+1400))=1.12
    (1+(2.78(x+187))/(x+1587))/(1+(2.78x)/(x+1400))=1.12
    x*(1+x)^6 = 5(1+x)^6-5

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