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5 votes
A= a+b+c+d over 4 for c

User Thehpi
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1 Answer

6 votes

A= (a+b+c+d)/(4)
times 4 both sides
4A=a+b+c+d
minus (a+b+d) from both sides
4A-a-b-d=c
c=4A-a-b-d
User Technicalflaw
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