How to do 13-4x=1-x also show all steps?

Given :13-4x=1-x
Solution :
-4x+x=1-13 ( transfer -x to right side and change the sign from - to + ,the number 13 also when we transfer to the
left side you must change the sign from + to - ,then add of the the same sign the different sign
minus the bigger number will carry the sign)
-3x=-12
-3x/-3 = -12/-3 ( in order to get the x you divide the same number and sign both sides)
X = 4 answer