15 + 80/90 = 143/9 = 15.888
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80+90+100=170+100=270
80 + 10 = 90 - 0 or 80 + 10 = 90 is true
200
80 + 10 equals 90 so the missing value is zero, ie 80 + 10 = 90 - 0
The result of the equation - 90 plus 90 plus 60 plus 80, is found as follows; 90 + 90 + 60 + 80 = ( 90 + 90 ) + 60 + 80 = 180 + ( 60 + 80 ) = 180 + 140 = 320 Answer = 320