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x in (-oo:+oo)
20-x = (x^1)/2 // - (x^1)/2
20-x-((x^1)/2) = 0
20-x-(x/2) = 0
20-3/2*x = 0 // - 20
-3/2*x = -20 // : -3/2
x = -20/(-3/2)
x = 40/3
x = 40/3
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