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