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a in (-oo:+oo)
4*a+4/5 = -4 // + 4
4*a+4/5+4 = 0
4*a+24/5 = 0 // - 24/5
4*a = -24/5 // : 4
a = -24/5/4
a = -6/5
a = -6/5
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