Simplify the following:
25 (d-10)-23 (d+6)
25 (d-10) = 25 d-250:
25 d-250-23 (d+6)
-23 (d+6) = -138-23 d:
25 d+-138-23 d-250
Grouping like terms, 25 d-23 d-250-138 = (25 d-23 d)+(-250-138):
(25 d-23 d)+(-250-138)
25 d-23 d = 2 d:
2 d+(-250-138)
-250-138 = -388:
2 d+-388
Factor 2 out of 2 d-388:
Answer: | 2 (d-194)
