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c in (-oo:+oo)
c/4 = 5*c-172 // - 5*c-172
c/4-(5*c)+172 = 0
c/4-5*c+172 = 0
172-19/4*c = 0 // - 172
-19/4*c = -172 // : -19/4
c = -172/(-19/4)
c = 688/19
c = 688/19
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