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x in (-oo:+oo)
8-((1/3)*x) = 13 // - 13
8-((1/3)*x)-13 = 0
(-1/3)*x-13+8 = 0
-1/3*x-5 = 0 // + 5
-1/3*x = 5 // : -1/3
x = 5/(-1/3)
x = -15
x = -15
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