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Mexican coins have any value? Suppose that your mixture showed a good TLC separation with methylene chloride, but you inadvertently eluted the column with methanol.? Difference between tubular secretion and counter current exchange? Do men from Mars have green skin and antennae? 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)?