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x in (-oo:+oo)
15-((1/3)*x) = 12 // - 12
15-((1/3)*x)-12 = 0
(-1/3)*x-12+15 = 0
3-1/3*x = 0 // - 3
-1/3*x = -3 // : -1/3
x = -3/(-1/3)
x = 9
x = 9
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