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