John lines up all 15 plants in his garden. The plants are arranged so that the rightmost plant is the tallest of the plants and every plant after the first one is 3 cm taller than the plant to its immediate left. If the sum of the height of the shortest plant and the plant to the immediate left of the middle plant is equal to the midrange of the height of the 15 plants, how many centimeter tall is the tallest plant?

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