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x in (-oo:+oo)
4/7-5*x = 39/7 // - 39/7
4/7-5*x-(39/7) = 0
4/7-5*x-39/7 = 0
-5*x-5 = 0 // + 5
-5*x = 5 // : -5
x = 5/(-5)
x = -1
x = -1
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