Final answer:
If the variable only appears on one side of an equation, it can still be solved for the variable. Equations with variables on both sides can have no solution or infinitely many solutions.
Step-by-step explanation:
If the variable only appears on one side of an equation, then the equation can always be solved for the variable. However, an equation with variables on both sides can have no solution or infinitely many solutions. The presence or absence of solutions in an equation does not depend on whether the variable appears on only one side or on both sides.
Learn more about solutions to equations