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Lesson 2-3
21. 6 - 2(x + 6) = 3x + 4

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Step by step:
6 - 2(x + 6) = 3x + 4
6 - 2x -12 = 3x + 4
6 - 12 = 5x + 4
-6 = 5x + 4
-10 = 5x
-2 = x

So, x = -2
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