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(-7)+10=3
(-2)+(-5)=-7
3-7=-4
2-(-4)=2+4=6
-5-6(-6)=-5+36=31
-1-5=-6
4*(-3)=-12
(-20):(-5)=4
(-3)*(-2)*(-1)=6*(-1)=-6
- razy - =+
- + - = -
-(-..)=+