Verified answer

1) 6а + 8а = а * (6 + 8) = а * 14 = 14а

2) 28с - 15с = с * (28 - 15) = с * 13 = 13с

3) m + 29m = m * (1 + 29) = m * 30 = 30m

4) 98p - p = p * (98 - 1) = 97 * p = 97p

5) 17к + к = к * (17 + 1) = к * 18 = 18к

6) 4х + 13х + 15х = х * (4 + 13 + 15) = х * 32 = 32х

8) 67z - 18x + 37 = z * (67 - 18) + 37 = z * 49 + 37 = 49z + 37

9) 35x - x - 6 = x * (35 - 1) - 6 = x * 34 - 6 = 34x - 6