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C in (-oo:+oo)
(C-8)/8 = -3/4 // + -3/4
(C-8)/8-(-3/4) = 0
(C-8)/8+3/4 = 0
(4*(C-8))/(4*8)+(3*8)/(4*8) = 0
4*(C-8)+3*8 = 0
4*C-8 = 0
(4*C-8)/(4*8) = 0
(4*C-8)/(4*8) = 0 // * 4*8
4*C-8 = 0
4*C-8 = 0 // + 8
4*C = 8 // : 4
C = 8/4
C = 2
C = 2
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