Answer :
- Wrong in sign change
How?
- In commutative law the sign doesn't change whenever it is applied.
Thus
[tex]\\ \sf{:}\implies 3-6+5[/tex]
[tex]\\ \sf{:}\implies 3\underline{+5-6}[/tex]
[tex]\\ \sf{:}\implies 8-6[/tex]
[tex]\\ \sf{:}\implies 2[/tex]