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x in (-oo:+oo)
(1/5)*x-(1/5) = -4 // + 4
(1/5)*x-(1/5)+4 = 0
(1/5)*x-1/5+4 = 0
1/5*x+19/5 = 0 // - 19/5
1/5*x = -19/5 // : 1/5
x = -19/5/1/5
x = -19
x = -19
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