Question

-(2a+2b+3c)+(-2a-2b-3c)=
(-4+xy)-(4xy+3)=
-(6+x-y)+(3x+y-2)-(2y+2x-6)=

Answer 1

-(2a+2b+3c) + (-2a-2b-3c) = -2a-2b-3c-2a-2b-3c= -4a -4b -6c
(-4 + xy) - (4xy + 3) = -4 + xy - 4xy - 3 = -7 - 3xy
-(6+x-y) + (3x + y - 2) -(2y+2x-6) = -6 -x +y +3x +y - 2 -2y - 2x + 6 = 0