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x in (-oo:+oo)
6-((1/3)*x) = 1 // - 1
6-((1/3)*x)-1 = 0
(-1/3)*x-1+6 = 0
5-1/3*x = 0 // - 5
-1/3*x = -5 // : -1/3
x = -5/(-1/3)
x = 15
x = 15
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