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x in (-oo:+oo)
1.4 = x/0.8 // - x/0.8
1.4-(x/0.8) = 0
1.4-1.25*x = 0
1.4-1.25*x = 0 // - 1.4
-1.25*x = -1.4 // : -1.25
x = -1.4/(-1.25)
x = 1.12
x = 1.12
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