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x in (-oo:+oo)
0.5 = x/0.2 // - x/0.2
0.5-(x/0.2) = 0
0.5-5*x = 0
0.5-5*x = 0 // - 0.5
-5*x = -0.5 // : -5
x = -0.5/(-5)
x = 0.1
x = 0.1
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