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x in (-oo:+oo)
10/25 = 90*x // - 90*x
10/25-(90*x) = 0
10/25-90*x = 0
2/5-90*x = 0 // - 2/5
-90*x = -2/5 // : -90
x = -2/5/(-90)
x = 1/225
x = 1/225
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