11) 987 - (x+364) = 519
987 - x - 364 = 519
623 - x = 519
- x = 519 - 623
- x = - 104
x = 104
12) 3128 - (m+425) = 1509
3128 - m - 425 = 1509
2703 - m = 1509
- m = 1509 - 2703
- m = - 1194
m = 1194
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Answers & Comments
11) 987 - (x+364) = 519
987 - x - 364 = 519
623 - x = 519
- x = 519 - 623
- x = - 104
x = 104
12) 3128 - (m+425) = 1509
3128 - m - 425 = 1509
2703 - m = 1509
- m = 1509 - 2703
- m = - 1194
m = 1194