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x in (-oo:+oo)
(-1/7)*(x+14)-((1/9)*(x-9)) = x-6 // - x-6
(-1/7)*(x+14)-((1/9)*(x-9))-x+6 = 0
(-1/7)*(x+14)+(-1/9)*(x-9)-x+6 = 0
6-1/7*(x+14)-1/9*(x-9)-x = 0
6-1/7*(x+14)-1/9*(x-9)-x = 0
6-16/63*x-x-1 = 0
6-79/63*x-1 = 0
5-79/63*x = 0
5-79/63*x = 0
5-79/63*x = 0 // - 5
-79/63*x = -5 // : -79/63
x = -5/(-79/63)
x = 315/79
x = 315/79
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