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x in (-oo:+oo)
2/7-((4/7)*x) = 6 // - 6
2/7-((4/7)*x)-6 = 0
(-4/7)*x+2/7-6 = 0
-4/7*x-40/7 = 0 // + 40/7
-4/7*x = 40/7 // : -4/7
x = 40/7/(-4/7)
x = -10
x = -10
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