a number is doubled and then decreased by 12 the result is 56 what is the original number

Question

Algebraic expression

Answer 1

You can write this as an expression, where a number x is doubled (2x) and decreased by 12 (2x - 12).  You can then set this expression equal to 56 and solve for x.  

 

2x - 12 = 56

2x = 68

x = 34

 

The original number is 34.