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x in (-oo:+oo)
(4/5)*(-2*x-2) = 56/5 // - 56/5
(4/5)*(-2*x-2)-(56/5) = 0
(4/5)*(-2*x-2)-56/5 = 0
4/5*(-2*x-2)-56/5 = 0
(4/5*5*(-2*x-2))/5-56/5 = 0
4/5*5*(-2*x-2)-56 = 0
-8*x-64 = 0
(-8*x-64)/5 = 0
(-8*x-64)/5 = 0 // * 5
-8*x-64 = 0
-8*x-64 = 0 // + 64
-8*x = 64 // : -8
x = 64/(-8)
x = -8
x = -8
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