Question

Question #b47a8

Answer 1

Just like `1-1=0`..... `2a-2a=0`
Let's just make it look like cancel so it will look better and could be understood better
`cancel2a+3b-cancel2a+3b`
And just like
`1+1=2xx1`
`3b+3b=2xx3b`
`6b`