r-20=-26
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An empty set is a set with no elements. It can be symbolized by {} or ø. The solution set for an equation that has no solution is also called an empty set.
A point or set of numbers that is a solution to two equations.
5 x 8 = 40. "Solution set" is probably NOT the word to use here, as it refers to an algebra problem.
a set is defined as a collection of objects. In algebra, it is usually a collection of numbers and often a collection of solutions.
subsets ?