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Is 21 close to 30 and 40? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)? Suppose that your mixture showed a good TLC separation with methylene chloride, but you inadvertently eluted the column with methanol.? How to answer the question of material selection process of water bottle? Difference between tubular secretion and counter current exchange?