30-[-12-(+2-5)-7]+12
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30-[-12-(+2-5)-7]+12=
30-[-12-(-3)-7]+12=
30-[-12+3-7]+12=
30-[-16]+12=
30+16+12=58
30-[-12-(-3)-7]+12=
30-[-12+3-7]+12=
30-[-16]+12=
30+16+12=58
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