$$ \begin{aligned} x\cdot3 &= 21x\cdot101\cdot3+64x\cdot101\cdot3+125x\cdot101\cdot3&& \text{simplify right side} \\[1 em]x\cdot3 &= 6363x+19392x+37875x&& \\[1 em]x\cdot3 &= 63630x&& \text{move the $ \color{blue}{ 63630x } $ to the left side} \\[1 em]3x-63630x &= 0&& \text{simplify left side} \\[1 em]-63627x &= 0&& \text{ divide both sides by $ -63627 $ } \\[1 em]x &= \frac{0}{-63627}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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