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c in (-oo:+oo)
c/4-((c-6)/8) = 9/8 // - 9/8
c/4-((c-6)/8)-(9/8) = 0
c/4-((c-6)/8)-9/8 = 0
(-1*(c-6))/8+c/4-9/8 = 0
(-1*4*(c-6))/(4*8)+(8*c)/(4*8)+(-9*4)/(4*8) = 0
8*c-1*4*(c-6)-9*4 = 0
4*c-36+24 = 0
4*c-12 = 0
(4*c-12)/(4*8) = 0
(4*c-12)/(4*8) = 0 // * 4*8
4*c-12 = 0
4*c-12 = 0 // + 12
4*c = 12 // : 4
c = 12/4
c = 3
c = 3
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