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x in (-oo:+oo)
-(4*x)-1/5 = -17/5 // + -17/5
-(4*x)-1/5-(-17/5) = 0
17/5-4*x-1/5 = 0
16/5-4*x = 0 // - 16/5
-4*x = -16/5 // : -4
x = -16/5/(-4)
x = 4/5
x = 4/5
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