3.2/X＝2/5
    (2/3)/X＝2/5
    X:(2/3)＝12:(6/7)
    X:0.3＝0.9:0.5
    X:2/3＝12:6/7
    7:X＝4.8:36
    X:2/3＝012:6/7
    X:0.3＝0.9:05
    7/10X-1/6X＝32/33
    12/(x+2)=-(3/2)x+6
    4x^2+260x=264
    71x^2-340x+800=0
    2x²lnx-2x=-1
    2x²lnx-2x=-1
    2x²lnx-2x=1
    3（x-1）^2=1/27
    X-（X×10%）=850
    10x^2+27x-236=0
    6*x^4+12*x^3+5*x^2-x-1=0
    x^5-15x^4+85x^3-225x^2+274x-120=0

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