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=8+4-7
=12-7
=5
*-4-(5-7)+(4+5)
=-4-5+7+4+5
=16-9
=7
*(3)-(+11)+(-6)+(+12)
=3-11-6+12
=-2
*3+(-1+2-9)-(5-5)-4+5
=3-1+2-9-5+5-4+5
=15-19
=-4