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2014-11-04T22:30:09+02:00
5≤x-2
-x+2≤-5          (-1)
x-2≥5
x≥5+2
x≥7
x-2≤9
x≤9+2
x≤11
x∈{7, 8,9,10,11}
B={7,8,9,10,11}
13≤2x-1
-2x+1≤-13              (-1)
2x-1≥13
2x≥13+1
x≥14/2
x≥7
2x-1≤21
2x≤21+1
x≤22/2
x≤11
C={7,8,9,10,11}
A={7,8,9,10,11}
A=B=C
1 5 1