9×（1/30+1/20）+（x-9）/20=1
    3x+2x-1=0
    13+(x-3)x2.3-[8+(x-3)x2]=0.8
    2.5×1.2x= 4+2.5x
    2.5×1.2x-2.5x＝4
    √（12/n）=0.104
    x²－5.4x+10＝0
    r^2-9r=0
    r^2-9r=0
    sin(2sinx)
    ln（1+x）
    72000÷x÷π×sin(x)＝350
    72000÷x÷π×sin(x)＝350
    72000÷xπ×sin(x)＝350
    x-x*0.23=20
    x-x*0.2=20
    3x^2-3=0
    25220-(25220/1.13*0.13-x/1.13*0.13)*1.12-（25220/1.13+x/1.13）*0.0003-(25220/1.13-x/1.13)*0.05-3000=x
    25220-(25220/1.13*0.13-x/1.13*0.13)*1.12-（25220/1.13+x/1.13）*0.0003-(25220/1.13-x/1.13)*0.05-3000=x
    x-ln(x)=e-1

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