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x in (-oo:+oo)
10/200 = x/45 // - x/45
10/200-(x/45) = 0
1/20-1/45*x = 0 // - 1/20
-1/45*x = -1/20 // : -1/45
x = -1/20/(-1/45)
x = 9/4
x = 9/4
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