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x in (-oo:+oo)
0.18 = x/50000 // - x/50000
0.18-(x/50000) = 0
0.18-1/50000*x = 0 // - 0.18
-1/50000*x = -0.18 // : -1/50000
x = -0.18/(-1/50000)
x = 9000
x = 9000
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