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(8*x*((14*x-28)/2))/7 = 0
(8*x*(14*x-28))/(2*7) = 0
( 14*x-28 )
14*x-28 = 0 // + 28
14*x = 28 // : 14
x = 28/14
x = 2
( 8*x )
8*x = 0 // : 8
x = 0
x in { 2, 0 }
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