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x in (-oo:+oo)
4-(1/5) = 2*x+1 // - 2*x+1
4-(2*x)-(1/5)-1 = 0
4-2*x-1/5-1 = 0
14/5-2*x = 0 // - 14/5
-2*x = -14/5 // : -2
x = -14/5/(-2)
x = 7/5
x = 7/5
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