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x in (-oo:+oo)
3*x-(5*x)+5 = -9 // + 9
3*x-(5*x)+5+9 = 0
3*x-5*x+5+9 = 0
14-2*x = 0 // - 14
-2*x = -14 // : -2
x = -14/(-2)
x = 7
x = 7
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