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x in (-oo:+oo)
1/15 = x/90 // - x/90
1/15-(x/90) = 0
1/15-1/90*x = 0 // - 1/15
-1/90*x = -1/15 // : -1/90
x = -1/15/(-1/90)
x = 6
x = 6
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