Question

6 vezes um numero x menos 21 = a 6

Answer 1

6X -21 =6, 6X = 27, X = 9/2;

Answer 2

$6x-21=6\to\\\\\\ 6x=6+21\to\\\\ 6x=27\to \\\\ x= \frac{27}{6} \to\\\\ x= \frac{9}{2}$



Se quiser colocar em decimal a resposta será $x=4,5$