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this is a little tough if you go through it with all algebra - and I salute the presenter for going through it. It was fun to see the terms canceling ( 1/5 - 1/5 = 0 for examnple ). I chose to do it myself with - after the third line - getting common denominator and working the math - a lot less lines - but kinda needed a little calculator help- x( 1/21 + 1/77 + 1/165 + 1/285 ) = 200 cd = 3 5 7 11 19 = 21945 x( 1/(3*7) + 1/(7*11) + 1/( 3*5*11 ) + 1/( 3*5*19 ) ) = 200 x/21945 * ( (5*11*19) + ( 3*5*19 ) + ( 7*19 ) + (7*11) ) = 200 x/21945 * ( 1045 + 285 + 133 + 77 ) = 200 x/21945* ( 1540 ) = 200 x = ( 200 * 21945 ) /1540 x = 2850
