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c in (-oo:+oo)
(3/5)*(15*c+10) = 12*c-9 // - 12*c-9
(3/5)*(15*c+10)-(12*c)+9 = 0
(3/5)*(15*c+10)-12*c+9 = 0
3/5*(15*c+10)-12*c+9 = 0
3/5*(15*c+10)-12*c+9 = 0
6-3*c+9 = 0
15-3*c = 0
15-3*c = 0
15-3*c = 0 // - 15
-3*c = -15 // : -3
c = -15/(-3)
c = 5
c = 5
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