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x in (-oo:+oo)
(6-(7*x))/6 = 3*x // - 3*x
(6-(7*x))/6-(3*x) = 0
(6-7*x)/6-3*x = 0
(6-7*x)/6+(-3*6*x)/6 = 0
6-7*x-3*6*x = 0
6-25*x = 0
(6-25*x)/6 = 0
(6-25*x)/6 = 0 // * 6
6-25*x = 0
6-25*x = 0 // - 6
-25*x = -6 // : -25
x = -6/(-25)
x = 6/25
x = 6/25
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