Theory:

Solution to an equation:
 
Solution to an equation is the value that satisfies the equation.
 
Consider the equation \(x + 2 = 4\).
  
Value
(\(x\))
Equation
(\(x + 2 = 4\))
Equation satisfied or not?
\(1\)
\(1 + 2 = 4\)
No
\(2\)
\(2 + 2 = 4\)
Yes
\(3\)
\(3 + 2 = 4\)
No
\(4\)
\(4 + 2 = 4\)
No
 
From the above tabular column, it is understood that the equation \(x + 2 = 4\) is satisfied only if '\(x\)' takes the value as \(2\).
 
Therefore, the solution to the equation \(x + 2 = 4\) is \(x = 2\).