50a²-1800a+2086
    50a²-1800a+2086
    2n+n=171
    x^2+50x=0
    (1+x)^5=1.1
    3x/16=[(5-2x)/8]+2
    3x/16=5-2x/8+2
    1020x+1480x=30000+8000
    sinx/x=15.5/36.5
    8*x^2+13*x-21=0
    x^2+3*x+2.25=0
    z^3-7z^2+5z=1
    z^3-5z^2+7z=1
    400x²-800x＋39＝0
    2k²+12k-9＝0
     [(0+a+10000)-5000]*3% =0+a
     [(0+a+843+8000)-5000-843]*3% =0+a
    3x-½十1
     [(8000a+843+8000)-5000-843]*3% -2520=a
    3-1/2=3x1/2+1

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