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x in (-oo:+oo)
3/8 = x/50 // - x/50
3/8-(x/50) = 0
3/8-1/50*x = 0 // - 3/8
-1/50*x = -3/8 // : -1/50
x = -3/8/(-1/50)
x = 75/4
x = 75/4
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