Question

A quinta parte de um número x é igual a esse número menos 12?

Answer 1

$\Large\boxed{\begin{array}{l}\rm A~quinta~parte~de~um~n\acute umero~x~\acute e~igual\\\rm a~esse~n\acute umero~menos~12.Qual~\acute e~esse~n\acute umero?\\\underline{\boldsymbol{ soluc_{\!\!,}\tilde ao\!:}}\\\sf \dfrac{x}{5}=x-12\\\sf multiplicando~os~dois~lados~por~5~temos:\\\sf \backslash\!\!\!5\cdot\dfrac{x}{\backslash\!\!\!5}=5\cdot x-5\cdot 12\\\sf x=5x-60\\\sf 5x-60=x\\\sf 5x-x=60\\\sf 4x=60\\\sf x=\dfrac{60}{4}\\\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=15}}}}\end{array}}$