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x in (-oo:+oo)
(3/7)*x-((2/3)*x) = -6 // + 6
(3/7)*x-((2/3)*x)+6 = 0
(3/7)*x+(-2/3)*x+6 = 0
6-5/21*x = 0 // - 6
-5/21*x = -6 // : -5/21
x = -6/(-5/21)
x = 126/5
x = 126/5
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