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x in (-oo:+oo)
10/8 = x/2 // - x/2
10/8-(x/2) = 0
5/4-1/2*x = 0 // - 5/4
-1/2*x = -5/4 // : -1/2
x = -5/4/(-1/2)
x = 5/2
x = 5/2
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