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x in (-oo:+oo)
15-((1/3)*x) = 9 // - 9
15-((1/3)*x)-9 = 0
(-1/3)*x-9+15 = 0
6-1/3*x = 0 // - 6
-1/3*x = -6 // : -1/3
x = -6/(-1/3)
x = 18
x = 18
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