Question

The sum of 15 and 7 times a number is 99

Answer 1

15+7x=99
7x=99-15
7x=84
x=12
7*12+15=99

Answer 2

The answer is:

`15+7x=99\\x=12`

Explanation:

In order to determine the answer, we have to know about equations.

We use equations when we have to express a problem with variables and values. In this case, we have one variable that expresses "the number" that is mentioned in the statement.

It is important to declare that there is a sequence of resolve the math operations. First it is the multiplying and then the addition.

In this case:

x="a number"

`15+7x=99\\7x=99-15\\7x=84\\x=12`

Finally, we have the following equation of the problem and its solution:

`15+7x=99\\x=12`