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x in (-oo:+oo)
4*(9-(2*x)) = -28 // + 28
4*(9-(2*x))+28 = 0
4*(9-2*x)+28 = 0
4*(9-2*x)+28 = 0
64-8*x = 0
64-8*x = 0
64-8*x = 0 // - 64
-8*x = -64 // : -8
x = -64/(-8)
x = 8
x = 8
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