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The isosceles triangle has a perimeter of 7.5 m. Which equation can be used to find the value of x if the shortest side, y, measures 2.1 m? 2 x minus 2.1 equals 7.5 4.2 plus y equals 7.5 y minus 4.2 equals 7.5 2.1 plus 2 x equals 7.5