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x in (-oo:+oo)
0.5 = (x/20)/0.1 // - (x/20)/0.1
0.5-((x/20)/0.1) = 0
(-1/2)*x+0.5 = 0
0.5-1/2*x = 0 // - 0.5
-1/2*x = -0.5 // : -1/2
x = -0.5/(-1/2)
x = 1
x = 1
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