* 78 + c = 80
* a - 20 = 10 * 4 + y = 12
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Numerical equations have only numbers and symbols, while algebraic equations have variables also.
no algebraic expressions do not have equal signs but equations do.
The algebraic expression "twice a number z" can be represented as 2z. In this expression, the variable z represents the unknown number, and multiplying it by 2 gives you twice that number. This expression can be used in algebraic equations and formulas to represent scenarios where a number needs to be doubled.
The variables stand for an unknown number that has not yet been identified which has been kept as a variable for the purpose of finding the value of.
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