For the lengths of a triangle sides a, b and c there necessary and sufficienta<b+c, b<a+c, c<a+b (triangle inequality).

Herex=12 is impossible because 12>4+7=11x=7 is possiblex=6.25 possiblex=4.5 possiblex=2.9 impossible (7>4+2.9, must be <)

[actually, x>0, x<7+4=11 and x>7-4=3, x in (3; 11)]

So the answer is 4.5, 6.25, 7.

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