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22-09-2016
Mathematics

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Solve the following equation by COMBINING LIKE TERMS FIRST: 3x + 3 - x + 4 = 21

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22-09-2016

3x + 3 - x + 4 = 21

3x - x = 2x

2x +3 +4 = 21

3 + 4 = 7

2x + 7 = 21
-7 -7

2x = 14
--- ----
2 2

x = 7

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