Question
$$52900 = 2x+21$$
Answer
$$ x = \dfrac{52879}{2} $$
Explanation
$$ \begin{aligned} 52900 &= 2x+21&& \text{ swap the left and right side of the equation } \\[1 em]2x+21 &= 52900&& \text{ move 21 to the right } \\[1 em]2x &= 52900-21&& \\[1 em]2x &= 52879&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{52879}{2}&& \\[1 em] \end{aligned} $$
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