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In scientific notation: 5.0*10^2 = 500 As a Roman numeral: D = 500
2(3m-5)
(2/3) Two-thirds Two over three
Two expressions on both sides of the equal sign are equivalent to one of them changing sign when switched over to the other side. For instance: 5x = 3x + 10 Is equivalent to: 5x - 3x = 10 That means that you can very well "combine" them, if you don't forget to switch the sign. As it were, you would be switching it over and combining in a single step.