The Longstreet Clinic in Gainesville has extended its reach with the acquisition of two independent primary care practices — Mountain Internal Medicine in Demorest and Valley View Medical Center in Dahlonega. The merger was effective Tuesday, but has been in the works since February, said Dr. Rhett Weaver of Mountain Internal Medicine. “For most of the physicians that have been around a while that are used to working for ourselves, this is a big consideration where you’re not completely in charge,” he said.