x除以（1+x）等于0.5
    X除以1+X等于0.5
    2.94x-(2x+4) = 3.76
    2.94x-(2x-4)=3.76
    75.2+64+（21－x）*4.3＝（50+139.8+6.5x）/1.5
    118.4+64+（21－x）*4.3＝（50+113.2+6.5x）/1.5
    x+x/20+x/9=2000000
    x+x/20+x/9=3000000
    x/2-lnx+1=0
    x+x/20+x/9=5550000
    x+x/20+x/9=15000000
    x+x/20+x/9=11200000
    (1+0.066/12)＾x=2
    (1+0.066/12)＾12x=2
    10000*(1+0.066/12)＾12x=20000
    1.0055＾12x=2
    15＋X÷3=19
    1/[√x +√(x+1)]=√10 - 3
    10x÷100x=0.2
    x+x/20+x/9=15000000

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