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x in (-oo:+oo)
(1/5)*(7*x+6) = 7*x // - 7*x
(1/5)*(7*x+6)-(7*x) = 0
(1/5)*(7*x+6)-7*x = 0
1/5*(7*x+6)-7*x = 0
1/5*(7*x+6)-7*x = 0
6/5-28/5*x = 0
6/5-28/5*x = 0
6/5-28/5*x = 0 // - 6/5
-28/5*x = -6/5 // : -28/5
x = -6/5/(-28/5)
x = 3/14
x = 3/14
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