(89+300+90+87+92)/7=x
    (89+300+90+87+x)/7=94.5
    (89+300+90+87+x)/7=90
    (89+300+90+87+x)/7=95
    0.05s∧3＋0.6s∧2＋s＋1＝0
    150x（29-22）+90x30x（40x-30）=1950+720
    150x（29-22）+90x30x（40xx/10-30）=1950+720
    153.8×7.95+12.5x=8×（153.8+x）
    -2x+2=1/2x²+1/2x-2
    (9.82*10^4)/(0.5+x)=9810*x+9.81*10^4
    (9.82*10^4)/(0.5+x)=9810*x
    (2*9.81*10^4)/(0.5+x)= 9810*6x
    2.47x/(1+1.47x)=0.4
    sin(sqrt(2.1)x+x^3)/(ln(x^2-2))+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x^3)/(ln(x^2)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x^3)/(ln(x^2.857)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2.857)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2)-2)+e^x=tan(x)^2+7*sqrt(x)
    sin(sqrt(2.1)x+x)/(ln(x^2.857)-2)+e^x=tan(x)^2-7*sqrt(x)
    sin(sqrt(2.1)*x+x^3)/(ln(x^2.857)-e^2)+e^x=tan(x)^2-7*sqrt(x)

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