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c in (-oo:+oo)
(5-c)/3 = (2*c+2)/(-4) // - (2*c+2)/(-4)
(5-c)/3-((2*c+2)/(-4)) = 0
(5-c)/3+(-1*(2*c+2))/(-4) = 0
(-4*(5-c))/(-4*3)+(-1*3*(2*c+2))/(-4*3) = 0
-4*(5-c)-1*3*(2*c+2) = 0
-2*c-26 = 0
(-2*c-26)/(-4*3) = 0
(-2*c-26)/(-4*3) = 0 // * -4*3
-2*c-26 = 0
-2*c-26 = 0 // + 26
-2*c = 26 // : -2
c = 26/(-2)
c = -13
c = -13
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