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c in (-oo:+oo)
(-3/5)*(c+20) = 54 // - 54
(-3/5)*(c+20)-54 = 0
-3/5*(c+20)-54 = 0
-3/5*(c+20)-54 = 0
-3/5*c-66 = 0
-3/5*c-66 = 0
-3/5*c-66 = 0 // + 66
-3/5*c = 66 // : -3/5
c = 66/(-3/5)
c = -110
c = -110
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