3y^2-4+6y=0
    2x=0
    x=0
    20=3t+t*t
    x²+3x
    80*12*10+150*8*t=80*30*10
    2/x+1/(x+2)+1/(x+4)-1/(x+1)＝0
    2x^2-x-4=0
    S=1.04²(1.04−1/1.048−1)1.048*28600
    S=1.04²{1.04−1/1.048−1}1.048*28600
    S=1.04²[1.04−1/1.048−1]1.048*28600
    S=1.04²（1.04−1/1.048−1)1.048*28600
    e^(-x^2)=x^x-1
    (x+5)/(x-5)= -(3/2)
    x/1-x
    2-2x=(π-2)√1-x^2
    2-2x=(π-2)x
    2-2sinx=(π-2)sinx
    X/1.09*0.09-X/1.03*0.03=38367.63
    X/1.09*0.09-X/1.03*0.03=233204.97

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