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x in (-oo:+oo)
-((6/7)*x)-6 = -12/7 // + -12/7
-((6/7)*x)-(-12/7)-6 = 0
(-6/7)*x+12/7-6 = 0
-6/7*x-30/7 = 0 // + 30/7
-6/7*x = 30/7 // : -6/7
x = 30/7/(-6/7)
x = -5
x = -5
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