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c in (-oo:+oo)
(4/7)*(2*c+9) = 3/7 // - 3/7
(4/7)*(2*c+9)-(3/7) = 0
(4/7)*(2*c+9)-3/7 = 0
4/7*(2*c+9)-3/7 = 0
(4/7*7*(2*c+9))/7-3/7 = 0
4/7*7*(2*c+9)-3 = 0
8*c+33 = 0
(8*c+33)/7 = 0
(8*c+33)/7 = 0 // * 7
8*c+33 = 0
8*c+33 = 0 // - 33
8*c = -33 // : 8
c = -33/8
c = -33/8
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