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x in (-oo:+oo)
28/50 = x/75 // - x/75
28/50-(x/75) = 0
14/25-1/75*x = 0 // - 14/25
-1/75*x = -14/25 // : -1/75
x = -14/25/(-1/75)
x = 42
x = 42
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