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x in (-oo:+oo)
5*x-(64/9) = 64 // - 64
5*x-(64/9)-64 = 0
5*x-64/9-64 = 0
5*x-640/9 = 0 // + 640/9
5*x = 640/9 // : 5
x = 640/9/5
x = 128/9
x = 128/9
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