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5X = 2X + 9

subtract 2X from each side

5X - 2X = 2X - 2X + 9

3X = 9

divide each sides integer by 3

(3/3)X = 9/3

X = 3

------------check in original equation

5(3) = 2(3) + 9

15 = 6 + 9

15 = 15

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