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-(x\2-3x)+(x/2+3x)=-x²+3x+x²+3x=6x
(a+b-c)-(2a-b+2c)=a+b-c-2a+b-2c=-a+2b-3c
-(x/2-xy-z)-(-x/2+2xy+2z)=-x²+xy+z+x²-2xy-2z=-xy-z
2) = -x² +3x+ x² +3x =6x
3) =a+b-c-2a+b-2c= -a+2b-3c
4) =-x² +xy +z-x²-2xy-2z= -2x² -xy -z
2) -(x\2-3x)+(x\2+3x)=-x\4-3x\3+3x\3=9x\2
3) (a+b+c)-(2a-b+2c)=2a\2-ab+2ac+2ab-b\2+2bc-2ac+bc+2c\2=2a\2+ab-b\2+3bc+2c\2
4) -(x\2-xy-z)-(-x\2+2xy