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x in (-oo:+oo)
(8*x^1)/2 = 4 // - 4
(8*x^1)/2-4 = 0
(8*x)/2-4 = 0
4*x-4 = 0 // + 4
4*x = 4 // : 4
x = 4/4
x = 1
x = 1
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