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c in (-oo:+oo)
(2*c-15)/7 = (2*c)/9 // - (2*c)/9
(2*c-15)/7-((2*c)/9) = 0
(2*c-15)/7+(-2/9)*c = 0
(2*c-15)/7+(-2*c)/9 = 0
(9*(2*c-15))/(7*9)+(-2*7*c)/(7*9) = 0
9*(2*c-15)-2*7*c = 0
4*c-135 = 0
(4*c-135)/(7*9) = 0
(4*c-135)/(7*9) = 0 // * 7*9
4*c-135 = 0
4*c-135 = 0 // + 135
4*c = 135 // : 4
c = 135/4
c = 135/4
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