Simplifying an expression is getting rid of any brackets or parentheses, performing as many operations as you can - including combining like terms.
To evaluate an expression you would substitute the numerical values of all the variables, carry out all the operations (addition, multiplication etc) in the expression to reach the answer - the numerical value of the expression.
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Only like terms can be subtracted or added in algebraic expressions.
An algebraic expression is a process for evaluating expressions. Replacing variables with numerals and following a standard order of operations is used for the process.
It involves putting the expression in a solveable form.
2-9h+6-5n use h=3 and n=2
BOMDAS Brackets (parenthesis), Of, Multiplication, Division, Addition, Subtraction