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x in (-oo:+oo)
-6/7 = x/64 // - x/64
-(x/64)-6/7 = 0
-1/64*x-6/7 = 0 // + 6/7
-1/64*x = 6/7 // : -1/64
x = 6/7/(-1/64)
x = -384/7
x = -384/7
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