x+x*14.6%=699.3
    1.6x+0.5*(2200-x)=2310
    1.6x+0.5*(2200-x)=2310
    1.6x+0.5X(2200-x)=2310
    1.6X+0.5X(2200-X)=2310
    (6-k/8)^2-(k/8)^2-(9/2)^2 = 0
    (6-k/8)^2-(k/8)^2-(9/2)^2 = 0
    (6-k/8)^2 -(k/8)^2 - (9/2)^2 = 0
     (1+6%)X+(1-5%)X(2200-X)=2200+110
    0.3X+4(400-X)=860 (1+6%)X+(1-5%)X(2200-X)=2200+110
    4*a^3+0.6*a^2+2*a+0.36=0
    27+X=2[19+(20-X)]
    12*a^2+1.2a+2=0
    a^4+0.2*a^3+a^2+0.36*a+0.8 = 0
    a^4+0.2*a^3+a^2+0.36*a+0.8=0
    2X+3（X-4）=23
    s^3+9s^2+26s+26＝0
    1/3x-1/4/1/2-0.1x-0.05x/0.03=1
    x-1-3x/3=1+x/5
    37x^2+48x+12=0

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