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D( i )
2-(5*i) = 0
2-(5*i) = 0
2-(5*i) = 0
2-5*i = 0
2-5*i = 0 // - 2
-5*i = -2 // : -5
i = -2/(-5)
i = 2/5
i in (-oo:2/5) U (2/5:+oo)
0 = (5-(7*i))/(2-(5*i)) // - (5-(7*i))/(2-(5*i))
0-((5-(7*i))/(2-(5*i))) = 0
-((5-7*i)/(2-5*i)) = 0
(-1*(5-7*i))/(2-5*i) = 0
( -1 )
-1 = 0
i belongs to the empty set
( 5-7*i )
5-7*i = 0 // - 5
-7*i = -5 // : -7
i = -5/(-7)
i = 5/7
i = 5/7
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