make 100 by using 1, 7, 7, 7, 7

So, using only +, -, x, /, and parentheses, and ONLY these numbers:

1, 7, 7, 7, 7

how can you make 100? Is there more than one solution?

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Follow-Ups:
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Benjamin A. Bartsch
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Benjamin A. Bartsch
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Adrian Duma
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Raymond Manzoni
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: David R Tribble
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Raymond Manzoni
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Joshua Cranmer
- Re: make 100 by using 1, 7, 7, 7, 7
  - From: Thomas Nordhaus