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