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Suppose that the price p, in dollars, and the number of sales, x, of a certain hem are retated by 6p+3x+3px=99 it p and x are both functicns of time, measured in days. Find the rate at which x is changing when x=3,p=6, and otdp=1.6 The rate at which x is changing is (Round to the nearest hundredth as nc