When you say "sum", it means at least two numbers piled together.
If you can only use one number, then the only number that can give you 7 is 7.
If you add a single number - in this case minus seven - the "sum" is the number itself.
what is the sum of 7 and a number is more than 2?
n+7
2x + 7
?=2n+7
k + 7
'17' is a prime number. The sum of the digits is 1 + 7 = 8 > 7.
Eric is thinking of a number he said that is number is the sum of 7 and 8doubled what is Erik's number?
7(a+3)
The number is 7.
Would be that number. Example: 7+0= 7 0+7=7
7