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x in (-oo:+oo)
(5*x)/6 = 5/21 // - 5/21
(5*x)/6-(5/21) = 0
(5*x)/6-5/21 = 0
5/6*x-5/21 = 0 // + 5/21
5/6*x = 5/21 // : 5/6
x = 5/21/5/6
x = 2/7
x = 2/7
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