[tex]\Large\boxed{\begin{array}{l}\rm Perceba\,que\,temos\,5\,mac_{\!\!,}\tilde as\,cujo\,"peso"\,\acute e\,y.\\\rm A\,equac_{\!\!,}\tilde ao\,proposta\,\acute e\\\sf 5y+3=21+27\\\sf 5y+3=48\\\underline{\blue{\boldsymbol{ soluc_{\!\!,}\tilde ao\!:}}}\\\sf 5y+3=48\\\sf 5y=48-3\\\sf5y=45\\\sf y=\dfrac{45}{5}\\\\\sf y=9\blue{\checkmark} \end{array}}[/tex]
