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x in (-oo:+oo)
(2*(4-(8*x)))/2 = -86 // + 86
(2*(4-(8*x)))/2+86 = 0
(2*(4-8*x))/2+86 = 0
4-8*x+86 = 0
4-8*x+86 = 0
90-8*x = 0
90-8*x = 0
90-8*x = 0 // - 90
-8*x = -90 // : -8
x = -90/(-8)
x = 45/4
x = 45/4
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