Add and subtract of the following:
1) 9mn -16mnp + 25mn -32mnp
2) 62cd 21abc + 22aby -13abc
3) 18ps + 42ps 430p s. 42pas
4) 2a + 3.5a + 5.22a - 2.45a - 1.1a
5) 08b -1.6b + 1.2b +0.11b
6) 3.2cd -2.1cd + 2.2cd - 1.3cd
7) 80rps + 4.21rps +3.051p53 - 4.02rps
8) 15a + 30a + 51a - 25a - 12a
9) 8bc-12be + 15b c +5c
10) 20 a - Sa +4ab +12 ab-6abc-8a

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