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((7/4)*x-(1/16))*((2/3)*x-(16/15)) = 0
((7/4)*x-1/16)*((2/3)*x-16/15) = 0
(7/4*x-1/16)*(2/3*x-16/15) = 0
( 2/3*x-16/15 )
2/3*x-16/15 = 0 // + 16/15
2/3*x = 16/15 // : 2/3
x = 16/15/2/3
x = 8/5
( 7/4*x-1/16 )
7/4*x-1/16 = 0 // + 1/16
7/4*x = 1/16 // : 7/4
x = 1/16/7/4
x = 1/28
x in { 8/5, 1/28 }
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