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    abs(x)=1
    y=(1-0.1)y+700
    y=1-0.7y+700
    10=(21.56x+1*10^-6*x4)÷384.16
    ((6114+x)*5+941*4+504*3+113*2+212*1)/(7904+x)=4.7
    (6114+x)*5+941*4+504*3+113*2+212*1/(7904+x)=4.7
    ((6114+x)*5)+(941*4+504*3+113*2+212*1)/(7904+x)=4.7
    t(t-2)=6
    ((6114+x)*5)+941*4+504*3+113*2+212*1/(7904+x)=4.7
    (x-425)/x=0.35
    50-(100+x)*1%+X=10
    -50-(100+x)*1%+X=10
    (4n*n+2n)*(2n-1)*(2n-2)=140(n*n-n)*(n-2)
    x*x-15x+50
    (X+x+12)/2=85
    (X+x+12)/2=85
    (X+x+12)/285
    (X+x+12)/285
    (X+x-12)/2=85
    (X+12)+x=85/2

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