x+1＝0.197*(x)^2
    x+1＝0.197*(x-1)^2
    25+x＝32.057+147.498-x
    25+x＝32.057+147.498-x
    25+x＝32.057+147.498-x
    (0.0004253 - X) * (0.0000747 - 1.5X)^{1.5} = (0.0001777 - X) * (0.00007228 - 1.5X)^{1.5}
    x^2-(x-5)^2=12^2
    8(3x-1) -9(5x-11) -2(2x-7)=30
    x/20+x/30+x/42 = 3
    （X）/（X+17）=75.71%
    （X）/（X+9）=18.18%
    sqrt(76/25)=a
    sqrt(76/25)=a
    16-(18/5)^2=a
    16/5-a^2=16-(4-a)^2
    33+x-(600+x)*6%/4=60
    2s^3+7.5s^2+6^s+2.5=0
    x-x*6%/4=19.7
    5024x-241x²＝34384
    （38.5-x）/（255-x）=0.1

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