Respuesta :

sqdancefan
Let n represent the number.

"the sum of a number and 7" is (n+7)

Three times "the sum of a number and 7" is 3(n+7)

"is" translates to "=".

"five times the number" is 5n

Two less than "five times the number" is 5n-2

Your equation is
  3(n+7) = 5n-2