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x in (-oo:+oo)
(x^1)/4 = -5/8 // + -5/8
(x^1)/4-(-5/8) = 0
x/4+5/8 = 0
1/4*x+5/8 = 0 // - 5/8
1/4*x = -5/8 // : 1/4
x = -5/8/1/4
x = -5/2
x = -5/2
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