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x in (-oo:+oo)
9/19 = x/50 // - x/50
9/19-(x/50) = 0
9/19-1/50*x = 0 // - 9/19
-1/50*x = -9/19 // : -1/50
x = -9/19/(-1/50)
x = 450/19
x = 450/19
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