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x in (-oo:+oo)
(6/7)*x-((3/2)*x) = 6 // - 6
(6/7)*x-((3/2)*x)-6 = 0
(6/7)*x+(-3/2)*x-6 = 0
-9/14*x-6 = 0 // + 6
-9/14*x = 6 // : -9/14
x = 6/(-9/14)
x = -28/3
x = -28/3
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