2. Simplify:
(a) 100-120 + {40-(30-20)}]
(c) 60-[48-{16 + (8-4)}]
(e) {(31-9 + 8) = 10 } x 15 + 5
(g) (7=7 7 + 7-7)-(5-5 + 5 x 5 = 5)
(i) [100-{80 = (20 2)}] +3
(k) [{22 = 2 x 11+3}-{40 = 10 +3-5}]
(m) 9 of 600-{(14 of 650-2 of 50) = 3 + 4 of 250}
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