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7+7+7+7+7+7+7+7 is the same as 7 multiplied by 8, so the answer is 56.
7+7+7+7=28
One way (there may be more) is: 77/7 + 7 + 7 + 7 + 7/7 + 7/7 +7/7 + 7/7 + 7/7 = 11 + 21 + 5 = 37
7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 = 732 = 1104427674243920646305299201
7 + (7/7) + (7 x 7) - 7 = 50