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