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[Solved] If x + y = 12, y + z = 15 and x + z = 18, then find x + y +

x + z = 18 ----(3). By solving equations (1) and (2). ⇒ x – z = -3 ----(4). By solving equations (3) and (4). ⇒ x = 7.5. Put the value of x in equation (1).

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