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x in (-oo:+oo)
3/1.67 = 2*x // - 2*x
3/1.67-(2*x) = 0
3/1.67-2*x = 0
1.79640719-2*x = 0 // - 1.79640719
-2*x = -1.79640719 // : -2
x = -1.79640719/(-2)
x = 0.8982036
x = 0.8982036
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