$$ \begin{aligned} 17x+13\cdot\frac{1}{2} &= 90&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot17x+2\cdot13\cdot\frac{1}{2} &= 2\cdot90&& \text{cancel out the denominators} \\[1 em]34x+13 &= 180&& \text{ move 13 to the right } \\[1 em]34x &= 180-13&& \\[1 em]34x &= 167&& \text{ divide both sides by $ 34 $ } \\[1 em]x &= \frac{167}{34}&& \\[1 em] \end{aligned} $$

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