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x in (-oo:+oo)
2/25 = x/90 // - x/90
2/25-(x/90) = 0
2/25-1/90*x = 0 // - 2/25
-1/90*x = -2/25 // : -1/90
x = -2/25/(-1/90)
x = 36/5
x = 36/5
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