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    (x+1)*(x+2)*(x+3)=2184
    8x²-18x+7=0
    x^3+6x^2+2037x+4057=0
    x^3-3x^2+2028x-2025=0
    7*(7/12x-13)-5*(5/12x+13)=20
    0.25a∧2+16=2.25a∧2
    5sin(x)cos(x)=2cos(x)^2+1
    2x=6x
    3/√10a/5/2=√10/10a/(15/2-a)
    3/25=1/(75-10a)
    3/25=1/75-a
    3/√10a/5/2=√10/10a/15/2-a
    x^2+x=20000
    x/0.27-√3*x=6
    x^2+x=20000
    【(220+220)*63-x】*0.85+8*63=22278.45
    (x−7)(x+6)=0
    (0.5x)+[0.8×(25-x)]=17
    37x^2+7900=100√5800+58x^2
    37x^2+7900=100√5800+58x^2

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