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