Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 147855: Evaluate the expression 17-(-x)- -10 when x=3: Evaluate the expression 17-(-x)- -10 when x=3
Answer by vleith(1174) About Me  (Show Source):
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Given 17-(-x)- (-10)
Evaluate at x=3
Remember that subtracting a negative is the same as adding a positive
17-(-x)- (-10)
17-(-3) + 10
17 +3 + 10
20+10
30