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x in (-oo:+oo)
56*(56-((2*x)/4)) = 0
56*((-1/2)*x+56) = 0
56*(56-1/2*x) = 0
( 56-1/2*x )
56-1/2*x = 0 // - 56
-1/2*x = -56 // : -1/2
x = -56/(-1/2)
x = 112
( 56 )
56 = 0
x belongs to the empty set
x = 112
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