26=X+(X-6)*0.25
    8.4t-4.9t^2＝-4.8
    8.4t-4.9t^2＝-10
    x^6-14x^4+49*11=0
    0.1x+x=98
    203921.67+X/3=114709.90*3+（1613400-X）/14*3
    203921.67+X/3=114709.90*3+（1613400-X）*3
    203921.67+X/3=（114709.90+（1613400-X））*3/14
    203921.67+X/3=（114709.90+（1613400-X））*3/14
    203921.67+X/3=（535312.8867+（1613400-X））*3/14
    203921.67+X/3=535312.8867+（1613400-X）*3
    13.24c=（3.5+c）×7.98
    13.24c=（3.5+c）×7.96
    40000x－500×40000－50×40000－2000000＝0
    (8/5)*(5-4x)+(2/3)*(4x-5)=(-1/4)*(3x-5)-(9/5)*(5-3x)
    40000x－500×400000－50×40000－2000000＝0
    （x+8）/3=（x-9）/4
    a+1=0
    300x-120x-40x-2800000＝1000000
    50x－80×50-5×50-300＝0

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