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b)-(2y+3x)+(-4y+2x+1) = -2y-3x-4y+2x+1 = -6y-x+1
c)-(x-2xy)-(4x+xy)+(xy-x)= -x+2xy-4x-xy+xy-x=-6x+2xy
d)(2x+1)-(4x+3)=2x+1-4x-3=2x-2