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c in (-oo:+oo)
(1/2)*c-59+23 = 78 // - 78
(1/2)*c-78-59+23 = 0
1/2*c-114 = 0 // + 114
1/2*c = 114 // : 1/2
c = 114/1/2
c = 228
c = 228
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