There is one solution. To find it, divide both sides of the equation by 2. This leaves you with x=5, where 5 is your solution.
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None because without an equality sign it cannot be an equation
10
If a statement includes an "equals" sign ( = ) then the statement is an equation. By the way . . . it may or may not be a true statement. "10 equals 120" is not true.
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
-2t = -10