cosx+12sinx/x=0
    1-(1+X)-3/X=2.5
    59.275-2.538x-43.907x*2+43.907*2＝0
    59.275-2.358x-43.907/4*x^2＝0
    -x^3+6x^2-3x-9=0
    0=2x^3-5x^2+2x+1
    (7.13-x)/x=15.7
    (7.13-x)/x=15.7
    -2^(2*55.08 - 109) = (x-109) * ln2
    -2^(2*t - 109) = (2*t - 113.39) * ln2
    -2^(2*t - 109) = (2*t - 133.39) * ln2
    7y-(27-3y)=(27-3y)-2
    2/x-x^2+1
    2*x^3-3*x^2+2
    10000/158+15000/(x+101*0.16)=150
    10000/158+25000/(x+101*0.16)=150
    x^2-22x+20=0
    x2-22x+20=0
    -0.012*x^2-10.8*x+1200
    1=-2x+2

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