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x in (-oo:+oo)
64/56 = x/7 // - x/7
64/56-(x/7) = 0
8/7-1/7*x = 0 // - 8/7
-1/7*x = -8/7 // : -1/7
x = -8/7/(-1/7)
x = 8
x = 8
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