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2) 5(n+5) +2(n-1) = 5n+25+2n-2=7n+23
3) 2(n-5) -(5-n) = 2n-10-5+n=3n-15
5(n+5) +2(n-1)= 5n+25+2n-2=7n+23
2(n-5) -(5-n) = 2n-10-5-n=n-15