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((6/7)*x-(1/6))*((11/14)*x-(6/7)) = 0
((6/7)*x-1/6)*((11/14)*x-6/7) = 0
(6/7*x-1/6)*(11/14*x-6/7) = 0
( 11/14*x-6/7 )
11/14*x-6/7 = 0 // + 6/7
11/14*x = 6/7 // : 11/14
x = 6/7/11/14
x = 12/11
( 6/7*x-1/6 )
6/7*x-1/6 = 0 // + 1/6
6/7*x = 1/6 // : 6/7
x = 1/6/6/7
x = 7/36
x in { 12/11, 7/36 }
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