Question 7:$\\$ `(27-514)-(486-73)` $\\$  `27 - 514 = -487` $\\$  `486 - 73 = 413` $\\$  `-487 - 413 = -900`  $\\$  Question 8: $\\$`(43+863)-(137-57)` $\\$  `43 + 863 = 906` $\\$  `137 - 57 = 80` $\\$  `906 - 80 = 826` $\\$  Answer: `826`. $\\$  Question 9:$\\$ `(72−1956)−(−1956+28)` $\\$  `72−1956=−1884` $\\$  `−1956+28=−1928` $\\$  `−1884−(−1928)=−1884+1928=44` $\\$  Answer: `44` $\\$  Question 10:$\\$`(−385+210)+(385−217)` $\\$  `−385+210=−175` $\\$  `385−217=168` $\\$  `−175+168=−7` $\\$  Answer: `-7.` $\\$  Question 11: $\\$ `39+(13−26)−(62+39)` $\\$  `13−26=−13` $\\$  `62+39=101` $\\$  `39−13−101=26−101=−75` $\\$  Answer: `-75`. $\\$   `12)` $\\$ `28+(19−28)−(32−57)` $\\$  `19 - 28 = -9` $\\$  `32−57=−25` $\\$  `28−9+25=19+25=44` $\\$  Answer: `44.` $\\$  Question 13:$\\$ `386−(287+386)−(13+0)` $\\$  `287+386=673` $\\$  `13+0=13` $\\$  `386−673−13=386−686=−300` $\\$  Answer: `-300.` $\\$  Question 14:$\\$ `(−77+23)−(523−177)−210` $\\$  `−77+23=−54` $\\$  `523−177=346` $\\$  `21^0=1` $\\$  `−54−346−1=−400−1=−401` $\\$  Answer: `-401.` $\\$  Question 15: $\\$ `(435−167)−89−(435−89)` $\\$  `435 - 167 = 268` $\\$  `435−89=346` $\\$  `268−89−346=179−346=−167` $\\$  `16)` $\\$  `-329+(15-101)-(25-440)` $\\$  `15 - 101 = -86` $\\$  `25 - 440 = -415` $\\$  `-329 - 86 + 415 = -415 + 415 = 0` $\\$  `#` $thanhchauxinhvcl:3$