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Online ProgramOSHA is investigating some areas where the soil has been contaminated. They have three inequalities, one for each area in question. The overlapping area on the graph shows where the worst contamination was found. If the three inequalities are \(y\le -x+4,\ y\le x+6,\) and \(y\ge 4\), what are the x-values for the location where the contamination is the worst?