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x in (-oo:+oo)
(2*x)/7-4 = (6*x)/7 // - (6*x)/7
(2*x)/7-((6*x)/7)-4 = 0
(2*x)/7+(-6/7)*x-4 = 0
-4/7*x-4 = 0 // + 4
-4/7*x = 4 // : -4/7
x = 4/(-4/7)
x = -7
x = -7
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