Question

David tried to solve the equation 7x-2=2x+33. Read through his work and determine where he made a mistake which led to the

wrong answer. Determine the correct order of operations and prove your solution to be true.


David's work:

7x-2=2x+33
7x-2+2x=2x+33+ 2x
9x-2=33
9x 2+2= 33 +2
9x= 35
9x/9 = 35/9
x= 3.888

Answer 1

7x-2+2x=2x+33+ 2x error -2x

7x-2=2x+33

7x-2x=33+2

5x= 35

x= 35/5 = 7

Explanation: