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x in (-oo:+oo)
7/1 = x/5.5 // - x/5.5
7/1-(x/5.5) = 0
7-0.18181818*x = 0
7-0.18181818*x = 0 // - 7
-0.18181818*x = -7 // : -0.18181818
x = -7/(-0.18181818)
x = 38.50000039
x = 38.50000039
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