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[tex]\it \left.\begin{aligned} \it b-a=180 \Rightarrow b=180+a\\ \\ \it \dfrac{b}{a}=4 \Rightarrow b=4a\ \ \ \ \ \ \ \ \end{aligned}\right\} \Rightarrow 4a=180+a|_{-a} \Rightarrow 3a=180|_{:3} \Rightarrow a=60[/tex]
[tex]\it \left.\begin{aligned} \it b-a=180 \Rightarrow b=180+a\\ \\ \it \dfrac{b}{a}=4 \Rightarrow b=4a\ \ \ \ \ \ \ \ \end{aligned}\right\} \Rightarrow 4a=180+a|_{-a} \Rightarrow 3a=180|_{:3} \Rightarrow a=60[/tex]