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Distributive Law: a(b+c) = ab + ac
Associative Law: (a+b)+c = a+(b+c)
Commutative Law: a*b = b*a
3(x+2)+5x = (3x + 6) + 5x (distributive law)
= (3x + 5x) + 6 (associative law)
= (3+5)x + 6 (distributive law)
= 8x
I don't see that the commutative law is used here.