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c in (-oo:+oo)
(9*c+1/4)*(1/22-(10*c)) = 0
(9*c+1/4)*(1/22-10*c) = 0
( 1/22-10*c )
1/22-10*c = 0 // - 1/22
-10*c = -1/22 // : -10
c = -1/22/(-10)
c = 1/220
( 9*c+1/4 )
9*c+1/4 = 0 // - 1/4
9*c = -1/4 // : 9
c = -1/4/9
c = -1/36
c in { 1/220, -1/36 }
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