Question

[7-(8-3+7)]-(9-2)-(-6+3)-(3-7-9)

Answer 1

PRIMERO DEBES SOLUCIONAR LOS PARANTESIS
[7-(8-3+7)]-(9-2)-(-6+3)-(3-7-9)
[7-(12)]-(7)-(-3)-(-13)
[7-12]-7+3+13
[-5]-7+3+13
-5-7+3+13
4