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x in (-oo:+oo)
-((1/6)*x)-6 = -43/7 // + -43/7
-((1/6)*x)-(-43/7)-6 = 0
(-1/6)*x+43/7-6 = 0
1/7-1/6*x = 0 // - 1/7
-1/6*x = -1/7 // : -1/6
x = -1/7/(-1/6)
x = 6/7
x = 6/7
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