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x in (-oo:+oo)
0.5/0.2 = x/2 // - x/2
0.5/0.2-(x/2) = 0
2.5-1/2*x = 0 // - 2.5
-1/2*x = -2.5 // : -1/2
x = -2.5/(-1/2)
x = 5
x = 5
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