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12X - 7 = 4X + 9

subtract 4X from both sides

8X - 7 = 9

add 7 to both sides

8X = 16

divide both sides by 8

X = 2

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12(2) - 7 = 4(2) + 9

24 - 7 = 8 + 9

17 = 17

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14y ago

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