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x in (-oo:+oo)
-x-(6*x)-(4/7) = -179/56 // + -179/56
-x-(6*x)-(4/7)-(-179/56) = 0
179/56-x-6*x-4/7 = 0
21/8-7*x = 0 // - 21/8
-7*x = -21/8 // : -7
x = -21/8/(-7)
x = 3/8
x = 3/8
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