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    [(220+260)*56-x]*0.9+16*56=21802.48
    37646.4=[(260+220+220)*66-x]*0.85+(8+18)*66
    (S-5000)×[(5600÷5000)-(1800÷5000)]-S×8%×50%=0
    (5600-1800)×[(S-5000)÷5000 ]-S×8%×50%=0
    0.75:x=3:4
    X*0.0038=X-54441.29
    X*0.38%=X-54441.29
    X*0.38%=54441.29
    1/470(0.021L^1.85+0.25*260*260)L^0.84=0.374/0.2
    3.29=((0.021*x^1.85+380)^0.05)*x^0.84
    8:28=5:x
    x:28=5:8
    x^x=2^2048
    1.8x-x²=7.2
    0.45*11*a+(0.45+0.36)/2*11*(8-a)=34.98
    2x + 3 = 7
    (260*63-X)*0.95=12964.15
    x+sqrt(8-x^2)=sqrt(16-x^2)
    (3.2-0.8)*x=3.2*x-0.8*x
    610/1235=X/(0.1+X)

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