Mathematics
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    (3.75+0.9)*(1783+1761+1727+1698+1664+1639+1608+1574+1538+1516+1486+1454)*5
    (3.75+0.9)*(2155+2126+2091+2063+2035+2005+1972+1943+1906+1881+1852+1818)*5
    20*x^2+3x=43
    (2098.73-2000)/2098.73
    (39000+10.21284*1.30*20+1.56*20)/(11.212*1.67)
    (2137.2-1730)/2137.2
    (39000+10.21284*1.30*20+1.56*20)/(11.212*1.64)
    arctan(0.1x)+arctan(0.0086x)+-arctan(0.05x) = 90
    arctan(0.05X)+90=arctan(0.1X)+arctan(0.0086X)
    60+x=2x+18
    (60%-15%)*x/(1 x)*5% = 0
    254154/25
    cos1/25pie
    arctan(350/w)-arctan(35/w)=6.42
    a×30+120=a×35+20
    arctan(349.6/x)-arctan(40/x)=-1.39
    arctan(397.25/x)-arctan(35/x)=8.57
    arctan(40/x)-arctan(349.6/x)=6.39
    0.34×0.02×2.135×41
    111.502+5.04+41.79

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