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x in (-oo:+oo)
(4/5)*x = 64/125 // - 64/125
(4/5)*x-(64/125) = 0
(4/5)*x-64/125 = 0
4/5*x-64/125 = 0 // + 64/125
4/5*x = 64/125 // : 4/5
x = 64/125/4/5
x = 16/25
x = 16/25
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