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Evaluate the following expressions.
11. + 12+ - 52
12. -150 149
13. - 254 + - 120 + +315 =
14. +354 - - 467 =
15. - 645 - 867 =
16. -5 X -7 X -9
17. 10 x 5 x 2
18. 6.300 - - 70 =​