[(220+220+260）-x]*0.85=29504.75
    [（220+220+260）*55-x]*0.9=29504.75
    4x^2=(x-2)(x-1)^2
    x(x+1)^2=2(x-1)^3
    （x-129.055）*10-1-1=2
    73×7.98+87.6x=7.96×160.6
    73×7.98+87.6x=160.6×7.93
    （x-106.200）*10-1-1=2
    A-176658343.61-（A-150681321.92)*0.5%=51962.67
    （x-128.411）*10-1-1=2
    13.8+n×4.3
    X-X*0.065-(X+1127894)*0.0003=1127894
    sqrt(x+7)+sqrt(x+2)=sqrt(3*x+6)+sqrt(3*x+1)
    （lgx-lg4.35）*20=0.5
    （lg2-lg4.35）*40=x-14
    lgx=0.65
    12.14x=（x+3.5）×7.98
    （x-25+10）*0.6/（（x-25+10）*0.6+（180-x+15）*1.3＝24.6%
    x^2 + 5x + 6 = 0
    10000÷x+20000÷(x+60)=150

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