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2) 3x+5 = 11 x=2 (v)
3) 3≤x≤8 c,s=´{4,5,6,7} (f)
4) 20x-10 = 20 x=2 (f)
5) 5<x<8 c.s.={6,7} (v)
6) x>10 c.s=¨{11,12,13,....} (v)
7) √4 +√9 ≤5 (v)
8) 6≤√x≤12 x∈ N x=9
9)2(x+5) = 30 x= 1 (v)
10) x² +5 = √25 x=0 (v)