Answer:
you didn't write which sign the 1 is for the first part so I wrote both.
Explanation:
if it's 3x+1=4x-3:
subtract 1
3x=4x-4
subtract 4x
-x=-4
divide by -1
x=4
check:
3(4) +1=4(4)-3
13=16-3
13=13
one solution
if it's 3x-1=4x-3
add 1
3x=4x-2
subtract 4x
-x=-2
divide by -1
x=2
check:
3(2)+1=4(2)-3
6+1=8-3
7=5
no solution