Respuesta :
15-{2-[9+(5-1)-(2+8-9)+6]-7}+8
15-{2-[9+5-1-2-8+9+6]-7}+8
15-{2-9-5+1+2+8-9-6-7}+8
15-2+9+5-1-2-8+9+6+7+8
R/46
15-{2-[9+5-1-2-8+9+6]-7}+8
15-{2-9-5+1+2+8-9-6-7}+8
15-2+9+5-1-2-8+9+6+7+8
R/46