It combines like terms and results in the least amount if variables to solve for
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Simplifying an equation often helps solve it.
There is no equation (or inequality) to solve. 15yz is an expression and an expression cannot be solved.
you can only solve for one in an equation so it can equal something
You can't. Math is not an algebraic expression. Simplifying an equation, however, can take multiple forms. Sometimes simplify simply means to solve an equation. Other times, it can mean to bring an equation into a standard form, such as with line equations, or quadratic equations.
The question contains an algebraic expression but there is no equation to solve.