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c in (-oo:+oo)
(5/9)*(c+8) = -20 // + 20
(5/9)*(c+8)+20 = 0
5/9*(c+8)+20 = 0
5/9*(c+8)+20 = 0
5/9*c+220/9 = 0
5/9*c+220/9 = 0
5/9*c+220/9 = 0 // - 220/9
5/9*c = -220/9 // : 5/9
c = -220/9/5/9
c = -44
c = -44
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