x^2-0.736x+0.368=0
    tanx-x＝0.01758866
    n（n+2）=110
    x+0.03x=1419880.81
    x+0.09x=1419880.81
    2.25%（1-x）²=1.96%
    x+0.09x=1416042.15
    lnx/x-1
    （40+x-30）（300-10x ）=3360
    （40+x-30）（300-10）x =3360
    20*x*log(2,x)=50000000
    20*x*log(2,x)/100000000=0.5
    －6+m＝－6÷m
    －6＋m＝－6÷m
    x+2x+3x+4x+5x+6x+7x+8x+9x+10=55
    4/3x+7/5=2/11x+8/13
    1234567x+7654321=2345678x+8765432
    555555x+777777=444444x-999999
    8x-4x^2-4
    2800/126-X/1000=0.00381（2800+X）

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