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x in (-oo:+oo)
x+1/5 = (4*x)/15 // - (4*x)/15
x-((4*x)/15)+1/5 = 0
x+(-4/15)*x+1/5 = 0
11/15*x+1/5 = 0 // - 1/5
11/15*x = -1/5 // : 11/15
x = -1/5/11/15
x = -3/11
x = -3/11
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