What is the reasoning for each step in this solution of the equation 3+4x-3x=4

Given 3 + 4x - 3x = 4

Next is Combine like terms, so you combined the one that has a variable which is 4x-3x = 1x or just an x.

Combine like terms 3 + x = 4

Next is subtraction property of equality, so you will subtract 3 in both side like this ...

3-3 + x = 4-3.

Subtraction Property of Equality 3-3 + x = 4-3

then the answer will x = 1.