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c in (-oo:+oo)
2 = c/2.6+4 // - c/2.6+4
2-(c/2.6)-4 = 0
2-0.38461538*c-4 = 0
-0.38461538*c-2 = 0 // + 2
-0.38461538*c = 2 // : -0.38461538
c = 2/(-0.38461538)
c = -5.20000006
c = -5.20000006
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