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x in (-oo:+oo)
1/8 = (6/7)*x-(1/6) // - (6/7)*x-(1/6)
1/8-((6/7)*x)+1/6 = 0
(-6/7)*x+1/8+1/6 = 0
7/24-6/7*x = 0 // - 7/24
-6/7*x = -7/24 // : -6/7
x = -7/24/(-6/7)
x = 49/144
x = 49/144
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