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x in (-oo:+oo)
x/(-3) = 5/6 // - 5/6
x/(-3)-(5/6) = 0
x/(-3)-5/6 = 0
-1/3*x-5/6 = 0 // + 5/6
-1/3*x = 5/6 // : -1/3
x = 5/6/(-1/3)
x = -5/2
x = -5/2
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