Question

What is the property that justifies the illustrated step in solving the equation?
3x + 4 - 2x + 5 = 6x + 2
3x - 2x + 4 + 5 = 6x + 2

Answer 1

Commutative property of addition is being used.

This means that you can switch around where the numbers are and still get the same answer.

Hope this helps!