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a in (-oo:+oo)
2*(4*a+4) = -80 // + 80
2*(4*a+4)+80 = 0
2*(4*a+4)+80 = 0
8*a+88 = 0
8*a+88 = 0
8*a+88 = 0 // - 88
8*a = -88 // : 8
a = -88/8
a = -11
a = -11
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