Question

Решите уравнение y-4/7y=4,2

Answer 1

y-4/7y=21/5
35y-20y=147
15y=147
y=49/5

Answer 2

$frac{y-4}{7y}=4.2$
ОДЗ: y$neq$ 0
y-4=29.4y
y-29.4y=4
-28.4y=4
$y=-frac{10}{71}$