Number of Solutions
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The equations we have dealt with so far have had one solution. But there are other possibilities. You may know that there are equations that don't have any solutions at all, such as unsolvable problems. There are also equations that have an infinite number of solutions. Watch this video, taking note of the difference between these options.
Source: Khan Academy, https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:solve-equations-inequalities/x2f8bb11595b61c86:num-solutions-linear-equations/v/number-of-solutions-to-linear-equations
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