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Easy: Sum and difference of two numbers
Name the two unknowns, then write one equation for each fact in the story: usually one counts the items and the other adds up their values. Solve by substitution or elimination, and answer the question that was asked, with units.
Write a system of equations and solve it.
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Name the two unknowns, then write one equation for each fact in the story, such as one for the number of tickets and one for the total cost.
Two unknowns need two independent facts to pin them down. One equation alone, like a + c = 20, has many solutions.
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