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x in (-oo:+oo)
(10/9)*x-(1/3) = 1/21 // - 1/21
(10/9)*x-(1/3)-(1/21) = 0
(10/9)*x-1/3-1/21 = 0
10/9*x-8/21 = 0 // + 8/21
10/9*x = 8/21 // : 10/9
x = 8/21/10/9
x = 12/35
x = 12/35
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