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