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r in (-oo:+oo)
0 = 9*(2.5/1.2-r) // - 9*(2.5/1.2-r)
0-(9*(2.5/1.2-r)) = 0
-9*(2.5/1.2-r) = 0
-9*(2.08333333-r) = 0
( -9 )
-9 = 0
r belongs to the empty set
( 2.08333333-r )
2.08333333-r = 0 // - 2.08333333
-r = -2.08333333 // * -1
r = 2.08333333
r = 2.08333333
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