There are an infinite number of them.
Here are a few. '8' is the solution to each one.
5x + 2 = 42
3/4 x - 3 = 11 - x
2x cos(0°) = 9 + 7 sin(90°)
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a solution to an equation is the answer
How about: 2x = 16 meaning that x = 8
the solution is the answer to the equation. A solution is any value that makes the equation true. x + 2 = 10 has exactly one solution ....x=8 x + 2 > 10 has infinitely many solutions....x=9 or 10 or 11 or 12 or 13, etc
An equation that has no solution is called an equation that has no solution.