0.6*(88+x)=48+x
    30/(t/3108276+e^(0.00841*t)/58.32)+2041.2*e^(-0.010726667*t)-1=0
    30/(t/3108276+e^(0.00841*t)/58.32)+2041.2*e^(-0.010726667*t)-20000000000=0
    30/(t/3108276+e^(0.00841*t)/58.32)+2041.2*e^(-0.010726667*t)-11664=0
    30/(t/3108276+e^(0.00841*t)/58.32)+2041.2*e^(0.010726667*t)-20=0
    30/(t/3108276+e^(0.00841*t)/58.32)+2041.2*e^(0.010726667*t)-11664=0
    10.1-x/0.4=1/5
    （12827*0.0398+X）/（12827-X)=0.1
    【（220+220）*21-x】*0.9+8*21=6636
    30/1000/60/（pi*0.002^2）
    x-(x*5%)=2250678
    1/2(8-t)(6-t)=24
    0.0005487804878048716 + 1.00122 x
    600000=30000*x*314.16*sqrt(1-1/(1+x-0.0005305)^2)*20
    600000=30000*x*314.16*sqrt(1-1/(1+x-0.0005305)^2)*16
    x^0.78=371.552
    （40-x）*（20+2x）=1200
    x（68-2x）=640
    log(a,92.4)=0.78
    x/72+0.35x/72+0.35x*1.4/36=50

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