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x in (-oo:+oo)
-((1/2)*x)-1/5 = 1/3 // - 1/3
-((1/2)*x)-1/5-(1/3) = 0
(-1/2)*x-1/5-1/3 = 0
-1/2*x-8/15 = 0 // + 8/15
-1/2*x = 8/15 // : -1/2
x = 8/15/(-1/2)
x = -16/15
x = -16/15
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