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Best Answer

3X + 6 = 21

subtract 6 from each side

3X = 15

divide both sides integers by 3

X = 5

=======check

3(5) + 6 = 21

15 + 6 = 21

21 = 21

========checks

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11y ago
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Q: What is 3x plus 6 equals 21?
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