x（x-1.6）=14.7
    17m²＋8m＋16＝0
    11X²-X-680=0
    -1/12x²+2/3x+5/3=0
    5/2:x=1/4:2/5
    X/0.06×7=330－x/0.015
    775*n^275=10000
    300x+390(30-x)=17700
    300 x+390（30-x)=17700
    300 x+390（30-x)=17700
    300 x+390（30-x)
    300 x+390（30-x)
    x^1/2=2
    x^e=0
    60×（25-20）+（40-35）×x+（40×0.9）×（40-x）＝380
    60（25-20）+（40-35）x+（40×0.9）（40-x）＝380
    (8430+25+X)*(5.32467%+1.5%)*1/4=X
    x^x = -1
    sin(1/x) + cos(x ^ 2) = 0
    X+0.1X+49=1450

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