Question

решите уравнение х-х7=15/7

Answer 1

$x- frac{x}{7}= frac{15}{7}$
$x- frac{x}{7}- frac{15}{7}=0$
$(1- frac{1}{7})x- frac{15}{7}=0$
$frac{6}{7}x- frac{15}{7}=0$
$x= frac{15}{7}: frac{6}{7}$
$x= frac{15}{7}* frac{7}{6}$
$x=2,5$
$Otvet:2,5$