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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A solution is a value that satisfies an equation, makes it true. For example, the equation $x+1=4$ has the solution $x=3,$ since $3$ is the only value for $x$ that makes the equation true. The solution set for an equation can be everything from zero to infinitely many. The equation $x=x+1$ has zero solutions since it's impossible to add $1$ to a value and get the value itself. An equation can also have infinitely many solutions, like $x+x=2x.$ It is possible to enter any value for $x$ and the equation will be true.