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x in (-oo:+oo)
(8/21)*x-((1/6)*x) = 3 // - 3
(8/21)*x-((1/6)*x)-3 = 0
(8/21)*x+(-1/6)*x-3 = 0
3/14*x-3 = 0 // + 3
3/14*x = 3 // : 3/14
x = 3/3/14
x = 14
x = 14
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