Umm im pretty sure d= -3x im not to sure
Your final equation would be 3(x+1)= 3x+3 because if you do 3 times x you get 3x so if you do 3 times 1 you get 3 making the equation have infinite solutions.
The final answer is: 3(x+1)= 3x+3 for an infinite number of solutions.