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x in (-oo:+oo)
(5*(x+7))/9 = -66 // + 66
(5*(x+7))/9+66 = 0
(5*(x+7))/9+(9*66)/9 = 0
5*(x+7)+9*66 = 0
5*x+629 = 0
(5*x+629)/9 = 0
(5*x+629)/9 = 0 // * 9
5*x+629 = 0
5*x+629 = 0 // - 629
5*x = -629 // : 5
x = -629/5
x = -629/5
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