Resposta:
[tex] \Large\dfrac{x}{5} = \dfrac{4}{20} \\ \\ 20x = 5 \times 4 \\ \\ 20x = 20 \\ \\ x = \dfrac{20}{20} \\ \\ \Large\boxed{\green{ x = \bf 1}} \\ \\ \dfrac{1}{5} = \dfrac{4 \div 4}{20 \div 4} \\ \\\Large \boxed{ \dfrac{1}{5} = \dfrac{1}{5} } \\ \\ \Large\boxed{ \underline{\blue{ \bf \: Bons \: Estudos!}}}[/tex]
