SOLUTION: Solve for c: A = 1/3 ( a + b + c )

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Question 644063: Solve for c: A = 1/3 ( a + b + c )
Answer by jim_thompson5910(35256) About Me  (Show Source):
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A = 1/3 ( a + b + c )

3A = a + b + c

3A - a = b + c

3A - a - b = c

c = 3A - a - b