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