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b)2*(3x+2y-4z+5)+3(5x-8y+2z-1)+(4x-2y+7z+8) = 6x + 4y - 8z + 10 + 15x - 24y + 6z - 3 + 4x-2y+7z+8 = 25x - 22y + 9z +15
-(x+2y-3z+4)-3x-4y+5z-2)+(4y-y+5z-1)=
-x-2y+3z-4-3x-4y+5z-2+4y-y+5z-1=
-x-3x-2y-4y+4y-y+3z+5z+5z-4-2-1=
-4x-3y+13z-7
b)
2*(3x+2y-4z+5)+3(5x-8y+2z-1)+(4x-2y+7z+8)=
6x+4y-8z+10+15x-24y+6z-3+4x-2y+7z+8=
6x+15x+4x+4y-24y-2y-8z+6z+7z+10-3+8=
25x-22y+5z+15