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x in (-oo:+oo)
4-((1/3)*x) = 8 // - 8
4-((1/3)*x)-8 = 0
(-1/3)*x-8+4 = 0
-1/3*x-4 = 0 // + 4
-1/3*x = 4 // : -1/3
x = 4/(-1/3)
x = -12
x = -12
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