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x in (-oo:+oo)
-x/3 = 4/5 // - 4/5
-x/3-(4/5) = 0
-x/3-4/5 = 0
-1/3*x-4/5 = 0 // + 4/5
-1/3*x = 4/5 // : -1/3
x = 4/5/(-1/3)
x = -12/5
x = -12/5
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