Question 758955
The number = x
Three times the number + twice the number
                 3x + 2x
Thrice the number + 10
                 3x + 10

         3x + 2x = 3x + 10
Collect like terms.
Change signs as you cross equal sign.
        3x + 2x - 3x = 10
                   2x = 10
                     x= 5

   15 + 10 = 15 + 10
Hope this helps.
:-)