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2015-06-06T09:17:54+08:00

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An equation is an expression with an (equal) sign.

  56 x 30   (not an equation, no equal sign) Ф
  56 x 30 = 1, 680 (an equation, has an equal sign) √
  1 + 2     (Ф)
  1 + 2 = 3  (√)
   33 + 1 = 34 (√)
   578 + 9  (Ф)
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2015-06-08T17:37:40+08:00
a statement that the values of two mathematical expressions are equal
indicated by the sign =
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