A 12-foot by 15-foot patio is increased by placing a stone border around the patio. The width of the border is the same all around the patio. The perimeter of the patio after it is expanded is 74 feet. The equation which represents x, the width of the border is 2[ (12+2x) + 15+2x) ]=74. What is the width of the border?
1) 2 1/2 feet
2) 3 feet
4) 5 feet
5) 8 1/2 feet
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