Opuść nawiasy i przeprowadż redukcje wyrazów podobnych
a) -(2a-3b+5)+(4a-7b+3)-(-3a-2b-1=
b) -(-2x+5y-4)+(2x-3y-4)-(-3x-y+2)=
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-(2a-3b+5)+(4a-7b+3)-(-3a-2b-1)=
-2a+3b-5+4a-7b+3+3a+2b+1=
-2a+4a+3a+3b-7b+2b-5+3+1=
5a-2b-1
-(-2x+5y-4)+(2x-3y-4)-(-3x-y+2)=
2x-5y+4+2x-3y-4+3x+y-2=
2x+2x+3x-5y-3y+y+4-4-2=
7x-7y-2
a) =-2a-3b-5+4a-7b+3+3a+2b+1=5a-8b-4
b)=2x-5y+4+2x-3y-4+3x+y-2=7x-6y-2
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