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