$$ \begin{aligned} 650 \cdot \frac{20+273}{x+273} &= 345&& \text{multiply ALL terms by } \color{blue}{ x+273 }. \\[1 em](x+273)\cdot650 \cdot \frac{20+273}{x+273} &= (x+273)\cdot345&& \text{cancel out the denominators} \\[1 em]190450 &= 345x+94185&& \text{ swap the left and right side of the equation } \\[1 em]345x+94185 &= 190450&& \text{ move 94185 to the right } \\[1 em]345x &= 190450-94185&& \\[1 em]345x &= 96265&& \text{ divide both sides by $ 345 $ } \\[1 em]x &= \frac{96265}{345}&& \\[1 em]x &= \frac{19253}{69}&& \\[1 em] \end{aligned} $$

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