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x in (-oo:+oo)
-12 = (6*x)/7 // - (6*x)/7
-((6*x)/7)-12 = 0
(-6/7)*x-12 = 0
-6/7*x-12 = 0 // + 12
-6/7*x = 12 // : -6/7
x = 12/(-6/7)
x = -14
x = -14
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