Mathematics
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    0.9*20x+(50-x)20=750
    50x+50(x-30)=6500
    x^2-7.47156*x=185.9
    x3/3x+3-x
    12.49*X=1.71
    12.9*X=1.71
    (x-59.833)*(1-15%)/29.87=(x-53.193)*(1-15%)/29.74
    arctan(x/0.18)+arctan(x/6)+arctan(x/11)-arctan(x/0.6)-90=0
    arctan(x/0.18)+arctan(x/6)+arctan(x/10)-arctan(x/0.6)-90=0
    arctan(x/0.18)+arctan(x/6)+arctan(x/10)-arctan(x/0.6)-92=0
    arctan(x/0.18)+arctan(x/6)+arctan(x/11)-arctan(x/0.6)-92=0
    2(x-2)=50-3x
    arctan(x/0.18)+arctan(x/6)+arctan(x/11)-arctan(x/0.6)-90=0
    arctan(x/0.18)+arctan(x/6)+arctan(x/10)-arctan(x/0.6)-90=0
    arctan(x/0.18)+arctan(x/6)+arctan(x/10)-arctan(x/0.6)-90=0
    -180=-90-arctan(x/2)-2*arctan(x/18.92)+arctan(x/3.35)
    X*0.143+X=3.2
    X*0.134+X=11
    sinx-7π
    (10-20÷12)x6

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