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x in (-oo:+oo)
13-(x/2) = 25/2 // - 25/2
13-(x/2)-(25/2) = 0
13-(x/2)-25/2 = 0
1/2-1/2*x = 0 // - 1/2
-1/2*x = -1/2 // : -1/2
x = -1/2/(-1/2)
x = 1
x = 1
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