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x in (-oo:+oo)
2*(8-4*x) = -72 // + 72
2*(8-4*x)+72 = 0
2*(8-4*x)+72 = 0
88-8*x = 0
88-8*x = 0
88-8*x = 0 // - 88
-8*x = -88 // : -8
x = -88/(-8)
x = 11
x = 11
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