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x in (-oo:+oo)
x+7/7 = 4*x-(1/5) // - 4*x-(1/5)
x-(4*x)+7/7+1/5 = 0
x-4*x+7/7+1/5 = 0
6/5-3*x = 0 // - 6/5
-3*x = -6/5 // : -3
x = -6/5/(-3)
x = 2/5
x = 2/5
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