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[tex]\boxed{\begin{array}{c}\sf note~que~ap\acute os~a~express\tilde ao~(0+y)\\\sf n\tilde ao~h\acute a~sinal~de~+~nem~de~-\\\sf portanto~fica~subtendida~uma~multiplicac_{\!\!,}\tilde ao\\\sf assim~a~resoluc_{\!\!}\tilde ao~fica:\end{array}}[/tex]
[tex]\sf 2\cdot(0+y)\cdot3y=5\\\sf 2y\cdot3y=5\\\sf 6y^2=5\\\sf y^2=\dfrac{5}{6}\\\sf y=\pm\sqrt{\dfrac{5}{6}}\\\boxed{\begin{array}{c}\underline{\tt c\acute alculos~auxiliares:}\\\sf\sqrt{\dfrac{5}{6}}=\dfrac{\sqrt{5}}{\sqrt{6}}\\\sf\dfrac{\sqrt{5}}{\sqrt{6}}\cdot\dfrac{\sqrt{6}}{\sqrt{6}}=\dfrac{\sqrt{30}}{\sqrt{36}}=\dfrac{\sqrt{30}}{6}\end{array}}\\\sf y=\pm\dfrac{\sqrt{30}}{6}\\\huge\boxed{\boxed{\boxed{\boxed{\sf S=\bigg\{-\dfrac{\sqrt{30}}{6},\dfrac{\sqrt{30}}{6}\bigg\}}}}}[/tex]
