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x in (-oo:+oo)
4/5-(3*x) = o // - o
4/5-o-(3*x) = 0
4/5-o-3*x = 0
4/5-o-3*x = 0 // - 4/5-o
-3*x = -(4/5-o) // : -3
x = (-(4/5-o))/(-3)
x = (o-4/5)/(-3)
x = (o-4/5)/(-3)
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