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12 - [ 2+(-7) - (-2) ] +4
12 - [2 -7 +2 ] +4
12 -[ -3 ] +4
12 +3+4
R= 19
B) 3-[(3-4)+5-(7+8)-(15-14)+(7-8)]
3-[(-1)+5 -(15) -(1)+( -1) ]
3-[-1+5-15-1-1]
3-[+5 - 18]
3- [ -13]
3+13
R= 16