, 2025

Solution 1:

Solving, we get $18+18+18=3x$ or
$54=3x$, and so $x=\dfrac{54}{3}=18$.

Solution 2:

Since $18+18+18$ is equal to $3\times18$, then $18+18+18=3x$ can be written as $3\times18=3x$, and so $x=18$.

Solution 3:

Since $3x$ is equal to $x+x+x$, then $18+18+18=3x$ can be written as $18+18+18=x+x+x$, and so $x=18$.