X + .085X = 743.75 Get rid of the decimals: Since the maximum number of decimal places any of the numbers has is THREE, then we multiply every term by 1000 (1 with THREE zeros after it) (1000)X + (1000)(.085X) = (1000)(743.75) 1000X + 85X = 743750 1085X = 743750 X =X = 685.483871 Edwin