By definition a term is the basic unit of algebra which must contain 3 parts - a sign, a coefficient and a variable (e.g., 2n [+ sign implied, coefficient '2' and variable 'n'] and -7d). In the expression 2n-4-7d then, there are 2 terms.
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They are terms of an algebraic expression which can be simplified to: 2s+2d
It would be: 3(7-d) as an algebraic expression
It is: d/7
d + 5
The variable is d, in the algebraic expression 7d+2