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Anonymous
72+30=102
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90+x+72+30 = 180. If you add 90+72+30, you get 192. But to get 180 you have to subtract 12. 90+(-12)+72+30 =180 if x is -12
72 + 72 = 144
1 + 30 + 2 + 3 + 5 + 6 + 10 + 15 = 72
30 + 42 = 72
180+72=252