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    0=P*50-8*50-90*50-300
     x²+x = 68
    4/9X+1/6=19/15
    x²-2022x-1=0
    0.2(6000-x)+0.5x=1800
    7200/x=10000/(x+0.7)
    1.45乘以0.8减X除以2.5=2.5X
    n^n^4=64
    5(5(5X+1)+1)+1=131
     n^(n^4) = 64
    3x+3一(x+3)=24
    (10+x)/(8+2)+x/(8-2)=7
    24x-10+x=670
    a+㏒(2,a)=4
    10+x/(8+2)+x/(8-2)=7
    10+x/10+x/6=7
    2∧c+㏒(2,c)=4
    10x/10+x/6=7
    2∧c+㏒(2,c4)=
    b+2∧b=4

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