Ответ:
1) 7a + 18a - a - 9a = 15a
2) 12b - 5b - 4b + b = 4b
3) 6c + 4d + c + 3d = 7c + 7d
4) x + 2y + 3x + 4x = 8x + 2y
5) 15 + m + 6 + 2m = 3m + 21
6) 3k + 11 + 9 + k = 4k + 20
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Ответ:
764)
1) 7a + 18a - a - 9a = 15a
2) 12b - 5b - 4b + b = 4b
3) 6c + 4d + c + 3d = 7c + 7d
4) x + 2y + 3x + 4x = 8x + 2y
5) 15 + m + 6 + 2m = 3m + 21
6) 3k + 11 + 9 + k = 4k + 20