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x in (-oo:+oo)
5*x-(10*((1/2)*x-4)) = 40 // - 40
5*x-(10*((1/2)*x-4))-40 = 0
5*x-10*((1/2)*x-4)-40 = 0
5*x-10*(1/2*x-4)-40 = 0
5*x-10*(1/2*x-4)-40 = 0
40-40 = 0
0 = 0
0 = 0
x belongs to the empty set
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