Mathematics
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    x*x+2x+1=1815/1501
    1e-20 *x^5 + 5e-18 *x^4 -6e-11 *x^3 +6e-11 * x^2 +0.0978*x = 253.7
    9800=x(1+0.06)
    x^2+3x-1=15
    9x*x-7x-22=0
    9x*x-61x+80=0
    9x2-61x+80=0
    9x2
    16%=24%+x%+24%*x%
    16%=24%+x+24%*x
    16=24+x+24*x
    x+6+x+9=4(2x+3)+6/2
    4(2x+3)+6
    4(2x+3)+6/2
    3+n+6+n=36+n
    3n+6n=36+n
    x*16/(x+2000)
    500/(60-x)=1000/(100-x)
    59.08=X-2/x
    a²-15a+50=0

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