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x in (-oo:+oo)
13-((1/3)*x) = 6 // - 6
13-((1/3)*x)-6 = 0
(-1/3)*x-6+13 = 0
7-1/3*x = 0 // - 7
-1/3*x = -7 // : -1/3
x = -7/(-1/3)
x = 21
x = 21
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