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c in (-oo:+oo)
((7-(2*c))^1)/2 = ((1-(5*c))^1)/2 // - ((1-(5*c))^1)/2
((7-(2*c))^1)/2-(((1-(5*c))^1)/2) = 0
(7-2*c)/2-((1-5*c)/2) = 0
(7-2*c)/2+(-1*(1-5*c))/2 = 0
7-1*(1-5*c)-2*c = 0
3*c+6 = 0
(3*c+6)/2 = 0
(3*c+6)/2 = 0 // * 2
3*c+6 = 0
3*c+6 = 0 // - 6
3*c = -6 // : 3
c = -6/3
c = -2
c = -2
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