Step-by-step explanation:
line number           Property
Line 1: (-7x+3)+2x       associative (gathering -7x and 3)
Line 2: (3+(-7x))+2x. Â Â Â Â Commutative (change the positions of 3 and -7x)
Line 3: 3+(-7x+2x).      associatI’ve
Line 4: 3+(-5x)