Answer:
-9
Step-by-step explanation:
2x + 7 = -11
2x = -11 - 7
2x = -18
x = -9
x=2.5906672908862554,−0.2573339575529219
0.268
In the attached file
Answer: each of his friends got 24 marbles
216 / 3 = 72
72 / 3 = 24