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x in (-oo:+oo)
(7-(15*x))/9 = x // - x
(7-(15*x))/9-x = 0
(7-15*x)/9-x = 0
(7-15*x)/9+(9*(-x))/9 = 0
9*(-x)-15*x+7 = 0
7-24*x = 0
(7-24*x)/9 = 0
(7-24*x)/9 = 0 // * 9
7-24*x = 0
7-24*x = 0 // - 7
-24*x = -7 // : -24
x = -7/(-24)
x = 7/24
x = 7/24
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