Question
$$6(a+3) = 18+6a$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 6(a+3) &= 18+6a&& \text{simplify left and right hand side} \\[1 em]6a+18 &= 6a+18&& \text{move the $ \color{blue}{ 6a } $ to the left side and $ \color{blue}{ 18 }$ to the right} \\[1 em]6a-6a &= 18-18&& \text{simplify left and right hand side} \\[1 em]6a-6a &= 0&& \\[1 em]0 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 0 = 0 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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