Question 726918
Let x = the number of right answers.  Then the number of wrong answers is 10-x<P>
5 points for each right answer results in a score of 5x.  -1 point for each wrong answer is -1*(10-x) = -10 + x.<P>
The score is the sum of right and wrong answers:  5x + (-10 +x) = 6x-10
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