I am totally confused trying to help my son, on this problem
1 answer:
Answer: x=4
Step-by-step explanation: You have to distribute the negative signs
x - (4x-7)= 5x-(x+21)
x - 4x + 7 = 5x - x - 21
- 3x + 7 = 4x - 21
28 = 7x
X = 4
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