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x in (-oo:+oo)
3*x = (1/2)^4*x+20 // - (1/2)^4*x+20
3*x-((1/2)^4*x)-20 = 0
47/16*x-20 = 0 // + 20
47/16*x = 20 // : 47/16
x = 20/47/16
x = 320/47
x = 320/47
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