Question 513094
   3t(t+5)-t2 = 2t2+4t-1
    3t2+15t-t2=2t2+4t-1
       2t2+15t=2t2+4t-1
   2t2-2t2+15t=2t2-2t2+4t-1
           15t=4t-1
        15t-4t=4t-4t-1
           11t=-1
       11t/11 = -1/11
            t = -1/11