Three times the difference of a number and six is negative nine. Find the number.

Question

Three times the difference of a number and six is negative nine. Find the number.

Answer 1

Let x = a number

 

 

3(6 - x) = -9

 

Divide both sides of equation by 3.

 

6 - x = -3

 

Subtract 6 on both sides of equation.

 

-x = -9

 

Divide both sides of equation by -1.

 

x = 9

 

The number is 9.