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x in (-oo:+oo)
(2*x)/5+1/5 = -4 // + 4
(2*x)/5+1/5+4 = 0
2/5*x+21/5 = 0 // - 21/5
2/5*x = -21/5 // : 2/5
x = -21/5/2/5
x = -21/2
x = -21/2
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