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