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-165 - 7 + 15 = -150 - 7 = -157
179 + 13 - 19 = 160 + 13 = 173
173 - 89 - 173 = -89
124 -17 + 43 + 137 - 124 = 120 + 43 = 163
186 + 17 + 178 - 2 + 33 - 78 - 186 = 100 +17+33-2 = 150-2 = 148