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X plus 2 <9 atat multumesc

Răspuns :

x + 2 < 9
x < 9 - 2
x < 7
x ∈ {0, 1, 2, 3, 4, 5, 6} 
rezolvare:
x <9-2
x <7 => x € { 0,1,2,3,4,,5,6}
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