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y in (-oo:+oo)
((5/7)*y-3)*((5/7)*y+3) = 0
(5/7*y-3)*(5/7*y+3) = 0
( 5/7*y+3 )
5/7*y+3 = 0 // - 3
5/7*y = -3 // : 5/7
y = -3/5/7
y = -21/5
( 5/7*y-3 )
5/7*y-3 = 0 // + 3
5/7*y = 3 // : 5/7
y = 3/5/7
y = 21/5
y in { -21/5, 21/5 }
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