what should be added to (-x-2y-3z) to make it (x+2y+3z)
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A desel tank can hold 4000 litres of water when filled to the brim. It is 7/8 filled. If 2/5 of the water is removed, how much more desel must be added in order to fill the tank ?
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we have to add 2x-4y+4z to get 3x-2y+zplanation:
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