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x in (-oo:+oo)
7/20 = x/25 // - x/25
7/20-(x/25) = 0
7/20-1/25*x = 0 // - 7/20
-1/25*x = -7/20 // : -1/25
x = -7/20/(-1/25)
x = 35/4
x = 35/4
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