Definitions [3]
A balanced equation is one in which the value of the left-hand side (LHS) is equal to the value of the right-hand side (RHS).
Definition: Variables
A variable is a symbol, usually a letter (like x, y, or z), representing an unknown or changeable numerical value in an equation or an algebraic expression.
Definition: Constants
A constant is a fixed value that does not change.
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Examples: 5, −7, 256
