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x in (-oo:+oo)
0.2/1 = x/2 // - x/2
0.2/1-(x/2) = 0
0.2-(x/2) = 0
0.2-1/2*x = 0 // - 0.2
-1/2*x = -0.2 // : -1/2
x = -0.2/(-1/2)
x = 0.4
x = 0.4
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