（25.851+x）×2.15＝51.702+70.353-x
    （25.851+x）×1.95＝51.702+70.353-x
    （25.851+x）×1.75＝51.702+70.353-x
    （25.851+x）×1.55＝51.702+70.353-x
    60/a+2+1/2*a*(6/a+2)^2+7=16*6/(a+2)-(6/a+2)^2
    (58-y-35)(400+20y)=8400
    1+x/1
    2.93*(1-x^10)/(1-x)=331.62
    8.66*(1-x^10)/(1-x)=382.82
    10.8*(1-x^10)/(1-x)=451.38
    49.93*(1-x^10)/(1-x)=500.54
    X-X(1-20%)*20%=10080
    29.77*(1-x^10)/(1-x)=556.02
    31x^2-36x-196
    (3500Q*0.13-(5+150Q)-140)*0.12
    3500Q-(120+2000Q+231.75)=0
    3500Q-(120+2000Q+231.75)-(3500Q*0.13-(5+150Q)-140)*0.12=0
    (3500Q*0.13-(5+150Q)-140)*0.12=0
    3500Q-(120+2000Q+231.75)-(3500Q*0.13-(5+150Q)-140)*0.12
    x^2-13.9x+40.2=0

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