Question
$$23\cdot6 = (20+3)\cdot6$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 23\cdot6 &= (20+3)\cdot6&& \text{simplify left and right hand side} \\[1 em]138 &= 23\cdot6&& \\[1 em]138 &= 138&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 138 = 138 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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