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x in (-oo:+oo)
0.5 = x/25 // - x/25
0.5-(x/25) = 0
0.5-1/25*x = 0 // - 0.5
-1/25*x = -0.5 // : -1/25
x = -0.5/(-1/25)
x = 12.5
x = 12.5
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