20%（x+200-250）=x-250
    x²/1-x=0.00000064
    x㏑[x+√(1+x²)]
    1.3x(8x+5)=16.9
    1.3x(8x+5)=16.9
    1.3x(8x+5)=12.9.
    0.28x=13.44
    0.72x-16.56=x-30
    A+A*13%=2755520.78
    x*0.66*2.43*1.31=1.85
    x*0.66*2.91*1.31=2.57
    72%（x+7-30）=x-30
    4x+2×12=52
    x*0.66*2.91=2.57
    4x*x*x+18x*x+56x+40＝0
    x∧4－6x∧2+8x+7＝0
    2/pe-2(1/pe)²(1－e-pe)=0.708
    4.108x^3+6.142x^2+20.31x-7.075
    35 x+35×1=40x
    X+X*1.07=25000

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