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x in (-oo:+oo)
1/5-7*x = 6*x-519/5 // - 6*x-519/5
1/5-7*x-(6*x)-(-519/5) = 0
1/5-7*x-6*x+519/5 = 0
104-13*x = 0 // - 104
-13*x = -104 // : -13
x = -104/(-13)
x = 8
x = 8
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