Translation:
U = 4B
Put the 4 equations together and number them:
(1) T = B + 5
(2) T = C - 1
(3) U = 3C
(4) U = 4B
Solve (1) for B:
(5) T - 5 = B
Substitute (T - 5) for B in (4)
(6) U = 4(T - 5)
Solve (2) for C:
(7) T + 1 = C
Substitute (T + 1) for C in (3)
(8) U = 3(T + 1)
Substitute 3(T + 1) for U in (6)
(9) 3(T + 1) = 4(T - 5)
Solve (9) for T
Edwin