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x in (-oo:+oo)
7*x-(2*(6*x-1)) = 7/6 // - 7/6
7*x-(2*(6*x-1))-(7/6) = 0
7*x-2*(6*x-1)-7/6 = 0
(-2*6*(6*x-1))/6+(6*7*x)/6-7/6 = 0
6*7*x-2*6*(6*x-1)-7 = 0
12-30*x-7 = 0
5-30*x = 0
(5-30*x)/6 = 0
(5-30*x)/6 = 0 // * 6
5-30*x = 0
5-30*x = 0 // - 5
-30*x = -5 // : -30
x = -5/(-30)
x = 1/6
x = 1/6
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