1. Insert "x-1", where it says "y". Now you have:
x-1=2x+1
2. Subtract variable x from both sides. Now you have:
-1= 1x+1
3. Subtract 1 from both sides. Now you have:
-2= 1x
4. Divide 1 from both sides. Now you have:
-2=x (switch it to ) x=-2
Answer: x=-2
