Answer:
The required phrase is " three times the difference of x and seven plus ten
Explanation:
The given algebraic expression is

We have to first subtract x from seven i.e. x-7 and then multiply this expression by 3 to get:

The expression is added by a constant 10 i.e. we get the final expression as:

Difference of x and seven = (x-7)
Three times difference of x and seven = 3(x-7)
Three times difference of x and seven plus ten = 3(x-7)+10.