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(2*x+3/5)*(4*x-(10/7)) = 0
(2*x+3/5)*(4*x-10/7) = 0
( 2*x+3/5 )
2*x+3/5 = 0 // - 3/5
2*x = -3/5 // : 2
x = -3/5/2
x = -3/10
( 4*x-10/7 )
4*x-10/7 = 0 // + 10/7
4*x = 10/7 // : 4
x = 10/7/4
x = 5/14
x in { -3/10, 5/14 }
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