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d) -x(z - y) - z (-x + y) = -xz + xy + xz - yz = xy - yz
e) 4 (x + y) - 2 (x - y) - 3x (1 + y) = 4x + 4y - 2x + 2y - 3x - 3xy = -x + 6y - 3xy
f) - 5x (2 - y) - y (5x + 1) + 10x (- y + 1) = - 10x + 5xy - 5xy - y - 10xy + 10x = - y - 10 xy
d) -xz+xy+xz-yz=xy-xz
e)4x+4y-2x+2y-3x-3xy=-x+6y-3xy
f) -10x+5xy-5xy-y-10xy+10x=
-10xy
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