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x in (-oo:+oo)
1/1.5 = x/2 // - x/2
1/1.5-(x/2) = 0
0.66666667-1/2*x = 0 // - 0.66666667
-1/2*x = -0.66666667 // : -1/2
x = -0.66666667/(-1/2)
x = 1.33333334
x = 1.33333334
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