[tex]\cfrac{5a+4b}{5}=4\Leftrightarrow 5a+4b=20\Leftrightarrow 5a=20-4b\Rightarrow a=\cfrac{20-4b}{4}[/tex]
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[tex]\cfrac{5a+4b}{5}=4\Leftrightarrow 5a+4b=20\Leftrightarrow 5a=20-4b\Rightarrow a=\cfrac{20-4b}{4}[/tex]