$[ +15 -7-3+2]-[-15+6-7+1]+1-6+2 = \\$$7-[-15]-3 = \\$$7+15-3 = \\$$22-3 =19$
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$[+15-(+7+3-2)]-[-15-(-6+7-1)]-(-1+6-2)$=
=$[15-8]-[-15-0]-3$=
=$7-[-15]-3$=
=$7+15-3$=
=$19$
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