Teresa's age is 5 years more than twice Ben's age. If Ben is X years old, the expression gives sum of Ben's and Teresa's ages. If Ben is 7 years old, what would the sum of Teresa's age be ?

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.