Question

21-[-17+(19-4)+12] quero resolver

Answer 1

$21-[-17+(19-4)+12] \\21-[-17+(15)+12] \\21-[-17+15+12] \\21-[10] \\21-10=11$

Answer 2

21-[-17+(15)+12]=
21-[-17+15+12]=
21-[-17+27]=
21-[10]=
21-10= 11