Question
$$6900 = 900+1200x$$
Answer
$$ x = 5 $$
Explanation
$$ \begin{aligned} 6900 &= 900+1200x&& \text{ swap the left and right side of the equation } \\[1 em]900+1200x &= 6900&& \text{ move 900 to the right } \\[1 em]1200x &= 6900-900&& \\[1 em]1200x &= 6000&& \text{ divide both sides by $ 1200 $ } \\[1 em]x &= \frac{6000}{1200}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$
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