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x in (-oo:+oo)
0.8/2 = x/5 // - x/5
0.8/2-(x/5) = 0
0.4-1/5*x = 0 // - 0.4
-1/5*x = -0.4 // : -1/5
x = -0.4/(-1/5)
x = 2
x = 2
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