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c in (-oo:+oo)
(4/5)*(15*c-35) = 9*c-7 // - 9*c-7
(4/5)*(15*c-35)-(9*c)+7 = 0
(4/5)*(15*c-35)-9*c+7 = 0
4/5*(15*c-35)-9*c+7 = 0
4/5*(15*c-35)-9*c+7 = 0
3*c-28+7 = 0
3*c-21 = 0
3*c-21 = 0
3*c-21 = 0 // + 21
3*c = 21 // : 3
c = 21/3
c = 7
c = 7
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