Question

8supra10 -(9supra10-x)=4supra10

Answer 1

8/10 - ( 9/10 - x )= 4/10

9/10 - x = 8/10 - 4/10

9/10 - x = 4/10

x = 9/10 - 4/10

x = 5/10 { simplificăm cu 5 } = 1/2

Answer 2

$\frac{8}{10}-( \frac{9}{10}-x )= \frac{4}{10}$
Inmultim x cu 10 si astfel aducand la acelasi numitor
8-(9-10*x)=4
8-9+10*x=4
10*x=4-8+9
10*x=5
x=$\frac{5}{10}$
x=$\frac{1}{2}$