2y²－8y+9=0
    6x-x=55
    1.4*8-2x=6
    (x-9)/(98-9x)=4
    0.8*65+0.8*x+18=102
    （a+3）（a+4）（a+5）=120
    lnx+3
    2/3x-2=4/3(5/3x-2)^2-8/3(5/3x-2)-4
    50x^2-129x+117=0
    x＾x＾x＾6＝6
    x＾x＾x＾6＝6
    (x+3)/(x+4)
    x-3(1-2x)=11
    x-3(1-2x)=9
    x-3(1+2x)=9
    x-3(1+2x)=11
    3(x-2)=2-5(x-2)
    (n²+n)/2=136
    n²+n=270
    n^n=n

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