Answer:
c
Step-by-step explanation:
Solving the expression
we get -29
Step-by-step explanation:
We need to simplify 
Solving:

Using DMAS rule




So, solving the expression
we get -29
Keywords: Solving the expression
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1. 7x - 28 = 84
2. 7x = 112
3. x = 16
The midpoint of 85 and 90 is 87