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