Question

[20-(8-3)]-(9-4)=10
Está bien?

Answer 1

Si, primero resolvemos lo que es dentro de los paréntesis
[20-(8-3)] -(9-4)=10
[20-(5)] -(5)=10
(20-5)-5=10
15-5=10
10 = 10

Answer 2

si
(20-(8-3)-(9-4)=10
(20-5)-(9-4)=10
15-(9-4)=10
15-5=10
10=10