1-7+2=3*1

-4+2=3

-2=3

This is not a true statement, so there may have been an error in the equation. Let's check the second equation:

x-7=3(-1)+1

x-7=-3+1

x-7=-2

Adding 7 to both sides:

x=-2+7

x=5

Therefore, the correct solution is x=5.