Solve the following equation.
$3 + 2 x = 1 - x$ .

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Solution

$3 + 2 x = 1 - x$
$\Rightarrow 3 + 2 x + 1 = 1$
$\Rightarrow 3 x = 1 - 3$
$\Rightarrow 3 x = - 2$
$x = \frac{- 2}{3}$

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