（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
    X*(0.01*X+1)*(0.1*X+1)
    2x+38=(8/7)×(83.5+x)
    x×0.3%=120
    x÷0.3%=120
    2.463*(10^(-3))(x^4)+x-0.3162=0
    2.463*(x^4)+x-0.3162=0
    2x^2-80x+150=0
    4x^4-32x^3+144x^2-320x+399=0
    150x（X一25）+200x（X- 20）=3800
    x+x-1+x-2+x-3+x-4=423
    n²-11n=60
    w*w*(0.01w*w+1)*(0.000001w*w+1)=1000000
    w*w*(0.01w*w)*(0.000001w*w)=1000*1000
    (X+24)*10/2-(24-X)*10/2=150

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