The best replacement for simplify is evaluate.

The best alternatives to simplify are rated as following:
★★★★★  evaluate
★★★★  solve
★  factor
★  reduce
★  not to simplify
  stripe

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Speaking about simplify, one probably shouldn't forget about parentheses.

Other search terms related to simplify and their ratings are:
★★★★★ parentheses
★★★★★ positive exponents
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simplify
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