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x in (-oo:+oo)
7/90 = x/65 // - x/65
7/90-(x/65) = 0
7/90-1/65*x = 0 // - 7/90
-1/65*x = -7/90 // : -1/65
x = -7/90/(-1/65)
x = 91/18
x = 91/18
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