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b) -4(x-z)-(x+y) = -4x+4z-x+y=5x+4z+y
c) 5(4x-7)+(7-4x) = 20x-35 +7-4x=16x-28
d) (4x-y)-2(x+y) = 4x-y-2x-2y=2x-3y
e ) 2(3x-2y+3z)-5(x-y-z) = 6x-4y+6z-5x+5y+5z=x-y+11z
f) 4x(x-y-z)-2x(4x-y+z) = 4x²-4xy-4xz-8x²-2xy+2xz=-4x²-6xy-2xz