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x in (-oo:+oo)
-69/14 = (-6/7)*x+x-5 // - (-6/7)*x+x-5
5-((-6/7)*x)-x-69/14 = 0
(6/7)*x-x-69/14+5 = 0
1/14-1/7*x = 0 // - 1/14
-1/7*x = -1/14 // : -1/7
x = -1/14/(-1/7)
x = 1/2
x = 1/2
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