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c in (-oo:+oo)
(1/5)*(2*c-3)-((3/10)*(2*c+1))-((3/4)*c)-1/2 = 0
(1/5)*(2*c-3)+(-3/10)*(2*c+1)+(-3/4)*c-1/2 = 0
1/5*(2*c-3)-3/10*(2*c+1)+(-3*c)/4-1/2 = 0
(1/5*2*4*(2*c-3))/(2*4)+(-3/10*2*4*(2*c+1))/(2*4)+(-3*2*c)/(2*4)+(-1*4)/(2*4) = 0
1/5*2*4*(2*c-3)-3/10*2*4*(2*c+1)-3*2*c-1*4 = 0
-8/5*c-6*c-36/5-4 = 0
-38/5*c-36/5-4 = 0
-38/5*c-56/5 = 0
(-38/5*c-56/5)/(2*4) = 0
(-38/5*c-56/5)/(2*4) = 0 // * 2*4
-38/5*c-56/5 = 0
-38/5*c-56/5 = 0 // + 56/5
-38/5*c = 56/5 // : -38/5
c = 56/5/(-38/5)
c = -28/19
c = -28/19
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