Question

Is x+2y+3z is equivalent to z+y+z+x+y+z

Answer 1

I believe it is equivalent.

There is 1 "x" in x+2y+3z and in z+y+z+x+y+z

There are 2 "y's" in z+y+z+x+y+z and in x+2y+3z

There are 3 "z's" in x+2y+3z and in z+y+z+x+y+z

So, yes they should be equal

Answer 2

Yes because U can only add like valuables