3 Answers
(5x-3)-(3x+9) remove parethesis, not related to problem
5x-3-3x+9 5x and 3x are like terms, so 5x-3x = 2x and
-3+9 = 6 are like terms so, 2x+6 is the answer. Without a value for x this cannot, be further simplified. look between paranthesis! or you'll need FOIL First Out Inside Last (5x-3)(-3x+9), = (5x * -3x + 5x * 9 - 3 * -3x - 3 *9)
Then solve all like terms to get ( -15x squared +54x - 27)
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