Hi Question States: .25(64 -x -33x) + .35x + .75(33x) = .50(64L) .25(64) - .25x - .25(33x) + .35x + .75(33x) = .50(64L) .50(33x) + .10x = .25(64L) x(.50(33) + .10) = .25(64L) x =My Point in the Set-up is to leave it intact prior to using Your calculator. One can easily check for simplifying errors and less chance for arithmetical errors Recheck the simplifying and use Your calculator. Wish You the Best in your Studies.