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a in (-oo:+oo)
a+4*a+4/5 = -101/30 // + -101/30
a+4*a+4/5-(-101/30) = 0
a+4*a+4/5+101/30 = 0
5*a+25/6 = 0 // - 25/6
5*a = -25/6 // : 5
a = -25/6/5
a = -5/6
a = -5/6
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