$$ \begin{aligned} 10000+220(x-30) &= 250x&& \text{simplify left side} \\[1 em]10000+220x-6600 &= 250x&& \\[1 em]220x+3400 &= 250x&& \text{move the $ \color{blue}{ 250x } $ to the left side and $ \color{blue}{ 3400 }$ to the right} \\[1 em]220x-250x &= -3400&& \text{simplify left side} \\[1 em]-30x &= -3400&& \text{ divide both sides by $ -30 $ } \\[1 em]x &= \frac{-3400}{-30}&& \\[1 em]x &= \frac{340}{3}&& \\[1 em] \end{aligned} $$

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