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One number is one more than three times another. If their sum is decreased by three, the result is six. Find the numbers.? X2+5x+3x+15? Need help with the following equation. xy=arctan (x/y) Not sure how to solve an implicit differentiation with arctan.? Do you know how to solve this question about Discrete Mathematics? I am working on an experiment which deals with leeches, is there any way i can extract saliva from a leech?