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X in (-oo:+oo)
6.78 = (2*X)/0.4-X // - (2*X)/0.4-X
X-((2*X)/0.4)+6.78 = 0
X-5*X+6.78 = 0
6.78-4*X = 0 // - 6.78
-4*X = -6.78 // : -4
X = -6.78/(-4)
X = 1.695
X = 1.695
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