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x in (-oo:+oo)
-69/7 = x-6*x+1/7 // - x-6*x+1/7
-(-6*x)-x-69/7-(1/7) = 0
6*x-x-69/7-1/7 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x = 2
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