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x in (-oo:+oo)
5*((1/2)*x-1) = 0
5*(1/2*x-1) = 0
( 1/2*x-1 )
1/2*x-1 = 0 // + 1
1/2*x = 1 // : 1/2
x = 1/1/2
x = 2
( 5 )
5 = 0
x belongs to the empty set
x = 2
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