Question

1098-у×13=28776-20456​

Answer 1

$1098-y*13=28776-20456$

$1098-y*13=8320$

$13y=1098-8320$

$13y=-7222$

$y=-7222:13$

$y=-555\frac{7}{13}$

Ответ: $-555\frac{7}{13}$