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x in (-oo:+oo)
(6/7)*x-x = (11/12)*x-5 // - (11/12)*x-5
(6/7)*x-x-((11/12)*x)+5 = 0
(6/7)*x-x+(-11/12)*x+5 = 0
5-89/84*x = 0 // - 5
-89/84*x = -5 // : -89/84
x = -5/(-89/84)
x = 420/89
x = 420/89
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