1. The problem states that we will not put brackets around variables in expressions. 2. This means when writing algebraic expressions, variables like x, y, or z will be written plainly without parentheses or brackets. 3. For example, instead of writing $(x)$ or $[x]$, we simply write $x$. 4. This simplifies notation and is common in algebra unless grouping is necessary for clarity or order of operations. 5. Always ensure that the meaning remains clear without brackets, especially in complex expressions. 6. If needed, use other grouping symbols like parentheses only when required to avoid ambiguity. 7. This approach helps in straightforward reading and writing of algebraic expressions. Final note: Variables are written without brackets as $x$, $y$, $z$, etc., unless grouping is essential.