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