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=-12(4-7)-3(4+2)(7-(10+2)+20+4(6-1))+12(7-9)+15-1
12(4-7)=-36
3(4+2)(7-(10+2)+20+4(6-1))=630
12(7-9=-24
=-(-36)-630-24+15-1
=36-630-24+15-1
=-604