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    4+(2x-3)÷5=7.8
    9000 = 1000/(1+r)^1 + 1000/(1+r)^2 + 10000/(1+r)^2
    (1-q^5)/(q^2+q^4+q^6)=25/27
    -0.5+50L^(-2)=0,
    (x-30)(140-2x)=600
    x^2-370x+2400
    (y+1)/2 = 3y-2
    y+1/2=3y-2
    (0.02-x)/x(0.96+x²)²=11000000
    (0.02-x)/x(0.96+x²)=11000000
    (0.02-x)/x×(0.96+x²)=11000000
    (0.02-x)/x(0.96+x²)=11000000
    0.02-x/x(0.96+x²)=11000000
    x^3-x+9/x
    0.9x-70=0.95x-100
    x(20-x)=(12-x)^2
    y=1.2^3-7.4*1.2^2+13.44*1.2
    35x+35×0.5(12-x)=350
    X×30×0.8=( X-5)×0.9×30
    Xx30X80%=(X-5)X90%×30

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