Solve the following equation:

$3 (x + 1) = 12 + 4 (x - 1)$

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Solution

$3 (x + 1) = 12 + 4 (x - 1) \Rightarrow 3 x + 3 = 12 + 4 x - 4 \Rightarrow 3 x - 4 x = 12 - 4 - 3 \Rightarrow - x = 5 \Rightarrow x = - 5$

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