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x in (-oo:+oo)
64/36 = x/9 // - x/9
64/36-(x/9) = 0
16/9-1/9*x = 0 // - 16/9
-1/9*x = -16/9 // : -1/9
x = -16/9/(-1/9)
x = 16
x = 16
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