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(2*x+4/5)*(4*x-(2/7)) = 0
(2*x+4/5)*(4*x-2/7) = 0
( 2*x+4/5 )
2*x+4/5 = 0 // - 4/5
2*x = -4/5 // : 2
x = -4/5/2
x = -2/5
( 4*x-2/7 )
4*x-2/7 = 0 // + 2/7
4*x = 2/7 // : 4
x = 2/7/4
x = 1/14
x in { -2/5, 1/14 }
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