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