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Best Answer

-x + 9 - 2x = -21

combine like terms -x and -2x

isolate -3x by subtracting 9 from both sides

divide both sides by -3

-3x + 9 = -21

- 9 - 9

-3x = -30

x = 10

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Q: How do you solve -x plus 9-2x equals -21?
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