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x in (-oo:+oo)
(7/9)*x = x-1000 // - x-1000
(7/9)*x-x+1000 = 0
1000-2/9*x = 0 // - 1000
-2/9*x = -1000 // : -2/9
x = -1000/(-2/9)
x = 4500
x = 4500
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