Question

O dobro de um número subtraído de 20 é igual a 100. Qual é o número?​

Answer 1

$\large\boxed{\begin{array}{l} \sf{O\, dobro\,de\,um\, n\acute{u}mero\, subtra\acute{i}do\, de} \\ \underline{ \underline{\sf{20\,\acute{e}\,iqual\,a\,100\, qual\, \acute e \, esse\, n\acute u mero?}}} \\ \sf{Um\, n\acute{u}mero \rightarrow{x}} \\ \underline{ \sf{Dobro\,de\,um\, n\acute{u}mero \rightarrow{2x}}} \\ \sf{2x - 20 = 100 \leftarrow Eq.\,do\,1^\circ} \\ \sf{2x = 100 + 20} \\ \sf{2x = 120} \\ \sf{x= \dfrac{120}{2} } \\ \huge\boxed{\boxed{\boxed{\boxed{\sf{x = 60}}}}}\end{array}}$