(7 1/3-t)-3 1/3=1 2/3
7 1/3-t=1 2/3+3 1/3 7 1/3-t=5 t=7 1/3-5 t=2 1/3
7 1/3-t-3 1/3=1 2/3; 4-t= 1 2/3; -t= 1 2/3-4; -t= -2 1/3; t= (-2 1/3)/(-1)=2 1/3. Ответ: 2 1/3.