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c in (-oo:+oo)
(1/5)*(2*c-3)+(-1/2)*c = (3/10)*(2*c+1)-((3/4)*c) // - (3/10)*(2*c+1)-((3/4)*c)
(1/5)*(2*c-3)-((3/10)*(2*c+1))+(-1/2)*c+(3/4)*c = 0
(1/5)*(2*c-3)+(-3/10)*(2*c+1)+(-1/2)*c+(3/4)*c = 0
1/5*(2*c-3)-3/10*(2*c+1)-c/2+(3*c)/4 = 0
(1/5*2*4*(2*c-3))/(2*4)+(-3/10*2*4*(2*c+1))/(2*4)+(4*(-c))/(2*4)+(2*3*c)/(2*4) = 0
1/5*2*4*(2*c-3)-3/10*2*4*(2*c+1)+4*(-c)+2*3*c = 0
6*c-8/5*c-4*c-36/5 = 0
6*c-28/5*c-36/5 = 0
2/5*c-36/5 = 0
(2/5*c-36/5)/(2*4) = 0
(2/5*c-36/5)/(2*4) = 0 // * 2*4
2/5*c-36/5 = 0
2/5*c-36/5 = 0 // + 36/5
2/5*c = 36/5 // : 2/5
c = 36/5/2/5
c = 18
c = 18
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