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x in (-oo:+oo)
1/5 = x/11.5 // - x/11.5
1/5-(x/11.5) = 0
1/5-0.08695652*x = 0
1/5-0.08695652*x = 0 // - 1/5
-0.08695652*x = -1/5 // : -0.08695652
x = -1/5/(-0.08695652)
x = 2.30000005
x = 2.30000005
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