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a in (-oo:+oo)
5*(4*a-8) = -80 // + 80
5*(4*a-8)+80 = 0
5*(4*a-8)+80 = 0
20*a+40 = 0
20*a+40 = 0
20*a+40 = 0 // - 40
20*a = -40 // : 20
a = -40/20
a = -2
a = -2
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