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c in (-oo:+oo)
(2*c)/3 = 5*c-78 // - 5*c-78
(2*c)/3-(5*c)+78 = 0
(2*c)/3-5*c+78 = 0
78-13/3*c = 0 // - 78
-13/3*c = -78 // : -13/3
c = -78/(-13/3)
c = 18
c = 18
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