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2014-05-16T11:46:23+03:00
 2,5(x+2)<=17,5
2.5x+5<=17.5
2.5x<=17.5-5
2.5x<=12.5
x<=12.5:2.5
x<=5
x apartine 0,1,2,3,4,5
2 5 2
2014-05-16T11:47:21+03:00
2x=1,5 +13
2x=14,5
x∈N   ⇒2x=14  ⇒x=7

2,5x+5≤17,5
2,5x ≤17,5-5
2,5x ≤12,5
x ≤5  ⇒x∈{0,1,2,3,4,5}