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x in (-oo:+oo)
(5/7)*x-((1/2)*x)+2/3 = 13/6 // - 13/6
(5/7)*x-((1/2)*x)+2/3-(13/6) = 0
(5/7)*x+(-1/2)*x+2/3-13/6 = 0
3/14*x-3/2 = 0 // + 3/2
3/14*x = 3/2 // : 3/14
x = 3/2/3/14
x = 7
x = 7
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