first distribute the - sign to the parenthesis to get
3x-2x-1=4x-6
your new equation after combining the like terms on the left side would be
x-1=4x-6
subtract the 4x and add the 1 so you can get all the x's on one side and the numbers on the other
-3x=-5
divide by negative 3 to find x
x=5/3