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x in (-oo:+oo)
16/40 = x/55 // - x/55
16/40-(x/55) = 0
2/5-1/55*x = 0 // - 2/5
-1/55*x = -2/5 // : -1/55
x = -2/5/(-1/55)
x = 22
x = 22
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