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    24*x^3=6*x^4
    720(1+x)²=2205
    112(1+x)²=340.5
    3x+4(x+4000)=44000
    x^3-4x^2+5x+2
    10(1+x)×2000(1+2x)=60000
    0.145*((1+x^2)-1)^(1/2)+1=(1+x^2)-ln((1+(1+x^2))/2)
    x²-75x+1350=0
    0.145*(y-1)^(1/2)+1=y-ln((1+y)/2)
    2cos(a)+3sin(a)=2
    2cos(a)+3sin(a)=5
    ln(x+6)
    4x+6=8
    4x-6=8
    (3y²-140)y²=-1600
    (3y²-140)y²=-1600
    [140-(2x)²]x²=1200
    2x+1+2(x+1)+x+1=69
    40x-320=30x+420
    40x-320=30x+420

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