-(-5+6-3+6)+3-(5+2-1)=(5-6+3-6)+3(-5-2+1)=(-4)+3(-4)=-12(-4)=48
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-(-5+6-3+6)+3-(5+2-1)
=(5-6+3-6)+3(-5-2+1)
=(-4)+3(-4)
=-12(-4)
=48