Iam thinking of a number. multiplying it by 7 and adding 2 is equal to multiplying it by 2 and adding 7. what is the number?

The number you are thinking is 1

Solution:

Let the number you are thinking be = x

Multiplying the number by 7 = 7x

Adding the number 2 = 7x + 2

Multiplying the number by 2 = 2x

Adding the number 7 = 2x +7

Both these equation are equal to one another

7x + 2 = 2x + 7    

Simplify the equation,    

7x - 2x  = 7 - 2    

5x = 5

x = 1

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.