Equations can contain more than one variable. In these cases, often, multiple solutions are possible. 
Assume, for example, x + y = 10. Then, it is possible that x is 5 and y is also 5. But it is also possible that x = 4 and y = 6 because 5 + 5 = 10 and 4 + 6 = 10. 
Both answers are true.
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