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x in (-oo:+oo)
2/10 = x/45 // - x/45
2/10-(x/45) = 0
1/5-1/45*x = 0 // - 1/5
-1/45*x = -1/5 // : -1/45
x = -1/5/(-1/45)
x = 9
x = 9
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