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x in (-oo:+oo)
(2/5)*(2*x-8) = -8 // + 8
(2/5)*(2*x-8)+8 = 0
2/5*(2*x-8)+8 = 0
2/5*(2*x-8)+8 = 0
4/5*x+24/5 = 0
4/5*x+24/5 = 0
4/5*x+24/5 = 0 // - 24/5
4/5*x = -24/5 // : 4/5
x = -24/5/4/5
x = -6
x = -6
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