60,61,62,63,64,65,66 - вот твое решение =)
<span>59<x<67</span>
<span>59<60<67</span>
<span>59<61<67</span>
<span>59<62<67</span>
<span>59<63<67</span>
<span>59<64<67</span>
59<65<67
59<66<67
<span>о.2t+1.7t- 0.54=0.22</span>