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x in (-oo:+oo)
(2*x)/(-3)-7 = -1 // + 1
(2*x)/(-3)-7+1 = 0
-2/3*x-6 = 0 // + 6
-2/3*x = 6 // : -2/3
x = 6/(-2/3)
x = -9
x = -9
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