1) а+(-b)-(2a)=a-b-2a=-a-b
2) -a-(+a)+2b-(-b)=-a-a+2b+b=-2a+3b
3) -a-(-b)-4a=-a+b-4a=-5a+b
4) -a-(+3a)+(-b)-b=-a-3a-b-b=-4a-2b
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1) а+(-b)-(2a)=a-b-2a=-a-b
2) -a-(+a)+2b-(-b)=-a-a+2b+b=-2a+3b
3) -a-(-b)-4a=-a+b-4a=-5a+b
4) -a-(+3a)+(-b)-b=-a-3a-b-b=-4a-2b