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c in (-oo:+oo)
-((2/5)*c) = 30 // - 30
-((2/5)*c)-30 = 0
(-2/5)*c-30 = 0
-2/5*c-30 = 0 // + 30
-2/5*c = 30 // : -2/5
c = 30/(-2/5)
c = -75
c = -75
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