how do you simplify an expression

A freight train with 80 cars transporters coal and iron ore. Each car carries either 100 tons of coal or 90 tons of ironn ore
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one set of parentheses to write an expression that simplifies to 7, 13, or 17. Do your work step by step and explain each step as you simplify the expression. Demonstrate the consequences of not using the proper order of operations by showing that other orders yield different answers.
by Level 1 User (140 points)
2/3 /4/15 x5/8
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