Jason S. answered 10/14/13
Tutor
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My goal is the success of my students. Knowledge-Patience-Honesty
I agree with William. You need to add some parentheses to clarify the question.
If you interpret the question as:
7 = ((5/6)*C) - 8
Add 8 to both sides.
15 = (5/6) * C
Multiply both sides by 6/5.
(6/5) * 15 = C
C = 18