SOLUTION: Please help me solve this problem (finding the pronumeral value) and explain the solution: 7(b-3)= -28

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Question 321963: Please help me solve this problem (finding the pronumeral value) and explain the solution:
7(b-3)= -28
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
7(b-3)= -28
7b - 21 = -28
7b = -28 + 21
7b = -7
b = -7/7
b = -1