X+X/1.13*0.13=72
    X+X/1.13*0.13=48
    X+X/1.13*0.13=46
    X+X/1.13*0.13=31
    X+X/1.13*0.13=30
    X+X/1.13*0.13=70
    X+X/1.13*0.13=68
    X+X/1.13*0.13=69
    X+X/1.13*0.13=85
    （85-X)*0.1469=X
    X÷(19+x)=0.67
    X除于19+x=0.67
    10368x-288x^2
    3(20－2x+x) ÷ 6= 7
    5x-2lnx+1
    x²-12x-18=0
    （1+x）^5=3.9
    cosx
    x*(4-x)＝2
    120=18/25X*X

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