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    30*(t-10)/60-20*(t+12)/60
    30*(t-10)/60-20*(t-10)/60
    arctan (-x)+arctan (2x/3)=90
    arctan x+arctan x/2=90
    1430x^2-1043900x+134000000=0
    1.4x=135%-1 3/5x
    30%x=3-7/10x
    43%x -18%x =0.975
    (11-10)*400+(11.5-10)*200-(12-y)*500=600
    290x=365
    x+0.09x=398
    x+1.09x=398
    x+0.06x=11088.91
    (48+x)/(89+x)=0.55
    (48+x)/(89+x)
    68.77=-14.51ln(x)+34.342
    72.07=-14.51ln(x)+34.342
    -4x^4 + 4x^2 -10^(-0.2425) = 0
    4x^2 -4x^4 = 10^(-3/10)
    0.687=-14.51ln(x)+34.342

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