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x in (-oo:+oo)
8.5/25 = x/50 // - x/50
8.5/25-(x/50) = 0
0.34-1/50*x = 0 // - 0.34
-1/50*x = -0.34 // : -1/50
x = -0.34/(-1/50)
x = 17
x = 17
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