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x in (-oo:+oo)
1/7 = (6/(-3))*x // - (6/(-3))*x
1/7-((6/(-3))*x) = 0
2*x+1/7 = 0
2*x+1/7 = 0 // - 1/7
2*x = -1/7 // : 2
x = -1/7/2
x = -1/14
x = -1/14
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