Alex's job pays $21 per hour.
If 'x' is the number of hours that Alex worked last week,
'y' is his gross pay for the week, before any deductions.
y = 21x
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If: x-32 = 8 Then: x = 40
That type of math problem is called an algebraic equation.
meaning to evaluate the variable in an expression. An algebraic expression is also a problem that contains no equals sign and you don't solve it, rather you simplify it.It means to solve something.
An algebraic expression