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12 = - 3t + 9

subtract 9 from each side

12 - 9 = -3t + 9 - 9

3 = - 3t

divide both sides integers by - 3

3/- 3 = (- 3/ - 3)t

- 1 = t

=======check in original equation

12 = - 3(- 1) + 9

12 = 3 + 9

12 = 12

=======checks

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Q: How do you answer this problem 12 equals -3t plus 9?
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