$$0 = 2x+6$$
Answer
$$ x = -3 $$
Explanation
$$ \begin{aligned} 0 &= 2x+6&& \text{ swap the left and right side of the equation } \\[1 em]2x+6 &= 0&& \text{ move the constants to the right } \\[1 em]2x &= -6&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= -\frac{6}{2}&& \\[1 em]x &= -3&& \\[1 em] \end{aligned} $$
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