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x in (-oo:+oo)
1/2 = x/50 // - x/50
1/2-(x/50) = 0
1/2-1/50*x = 0 // - 1/2
-1/50*x = -1/2 // : -1/50
x = -1/2/(-1/50)
x = 25
x = 25
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