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x in (-oo:+oo)
1/10 = x/18.5 // - x/18.5
1/10-(x/18.5) = 0
1/10-0.05405405*x = 0
1/10-0.05405405*x = 0 // - 1/10
-0.05405405*x = -1/10 // : -0.05405405
x = -1/10/(-0.05405405)
x = 1.85000014
x = 1.85000014
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