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x in (-oo:+oo)
(4*x)/6 = 4/5 // - 4/5
(4*x)/6-(4/5) = 0
(4*x)/6-4/5 = 0
2/3*x-4/5 = 0 // + 4/5
2/3*x = 4/5 // : 2/3
x = 4/5/2/3
x = 6/5
x = 6/5
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