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x in (-oo:+oo)
1/40 = x/380 // - x/380
1/40-(x/380) = 0
1/40-1/380*x = 0 // - 1/40
-1/380*x = -1/40 // : -1/380
x = -1/40/(-1/380)
x = 19/2
x = 19/2
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