Question
$$20 = -3x+19$$
Answer
$$ x = -\dfrac{1}{3} $$
Explanation
$$ \begin{aligned} 20 &= -3x+19&& \text{ swap the left and right side of the equation } \\[1 em]-3x+19 &= 20&& \text{ move 19 to the right } \\[1 em]-3x &= 20-19&& \\[1 em]-3x &= 1&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{1}{3}&& \\[1 em] \end{aligned} $$
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