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c in (-oo:+oo)
(1/2)*(c-13) = 19-c // - 19-c
(1/2)*(c-13)+c-19 = 0
1/2*(c-13)+c-19 = 0
1/2*(c-13)+c-19 = 0
3/2*c-19-13/2 = 0
3/2*c-51/2 = 0
3/2*c-51/2 = 0
3/2*c-51/2 = 0 // + 51/2
3/2*c = 51/2 // : 3/2
c = 51/2/3/2
c = 17
c = 17
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