Question

A certain number plus five is equal to double the number

plus twelve. Write the equation and find the certain number,

Answer 1

Answer:n+5=2n+12, n=-7

Explanation:

Answer 2

Let the certain number is x.
According to question,
x + 5 = 2x + 12
Or, 2x - x = 5 - 12
Therefore, x = -7

Hence, the required certain number is -7.