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    -0.0696x^2+1.2024x-4.9332=0
    7x+9=88
    5x+7=12
    k(2k+1)=10
    1.01^a=2
    100x=[100-(100x)]×0.1
    100x=[100-(100x)]×0.1
    147=14*a-a^2
    -x+(4/x)=2x+1
    -x+(4/x)=1
    -x+(4/x)=0
    -x+4/x
    x+x²=420
    44-x-(2x-1)
     80%(x-4)=3.2
    x+sin(x-2)=1
    x+1/x
    x+40=3.5(x-200)
    (x-3)/2+(x-1)/3=4
    40x*0.7=(x-6)*40*0.8

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