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x in (-oo:+oo)
-7*x-(5/6) = -x-(77/6) // + -x-(77/6)
x-7*x-(5/6)+77/6 = 0
x-7*x-5/6+77/6 = 0
12-6*x = 0 // - 12
-6*x = -12 // : -6
x = -12/(-6)
x = 2
x = 2
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