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x in (-oo:+oo)
(2*x)/8 = 4/5 // - 4/5
(2*x)/8-(4/5) = 0
(2*x)/8-4/5 = 0
1/4*x-4/5 = 0 // + 4/5
1/4*x = 4/5 // : 1/4
x = 4/5/1/4
x = 16/5
x = 16/5
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