29 - 1 will always equal 28. 29 - -1 will equal 30.
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30 - 1 = 29
(x-1)*(x+1) = x2 - x + x - 1 = x2 - 1 So, when x = 30, 29*31 = 30*30 - 1 Or, since 30*30 = 900, 29*31 = 900-1 = 899
(3/10) - (1/6) = (9/30) - (5/30) = (4/30) = 2/15
When you are using non-standard definitions of "plus" and "minus", or of "equal".
2/3 + 1 + 3/5 - 3/10 = 59/30 or 1 and 29/30