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DAVID SAITO-CHUNG, CARLA MOZEE and SCOTT LEHTONEN

The Dow Jones Industrial Average and other major market indexes finished higher in differing tempos Thursday, bolstered by a U.S.-Iran deal aimed at longer-term security in the Middle East. Intel (INTC), a 1990s superstock, was a big winner ahead of a three-day holiday, but hot new issue SpaceX (SPCX) lost ground in the stock market today. The Nasdaq composite closed…