Solve:
(a) 2/3 + 1/7
(b) 3/10 + 7/15
(c) 4/9 + 2/7
(d) 5/7 + 1/3
(e) 2/3 + 1/6
(f) 4/5 + 2/3
(g) 3/4 - 1/3
(h) 5/6 - 1/3
(i) 2/3 + 3/4 + 1/2
(j) 1/2 + 1/3 + 1/6
(k) \(1\frac{1}{3} + 3\frac{2}{3}\)
(l) \(4\frac{2}{3} + 3\frac{1}{4}\)
(m) 16/5 - 7/5
(n) 4/3 - 1/2