Question

Calculati un numar ,stiind ca inmultindu-l cu 1,3 obtinem acelasi rezultat ca atunci cand il adunam cu 3,72.Ajutati-ma va rog !

Answer 1

$a*1,3=a+3,72 \\ 1,3a=a+3,72$
$\frac{13a}{10}=\frac{25a+93}{25} \\ \frac{13a}{10}-\frac{25a+93}{25}=0 \\ \frac{13a*5-[(25a+13)*2]}{50}=\frac{15a-186}{50}=0 \\ \frac{3*(5a-62)}{50}=0 \\ 3*(5a-62)=0*50 \\ 3*(5a-62)=0 \\ 5a-62=\frac{0}{3} \\ 5a-62=0 \\ 5a=0+62 \\ 5a=62 \\ a=\frac{62}{5} \\ a=12,4$