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