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{[(a :7 +17) :4.3-11]:4+19 } :4=5
{[(7-b) .5-2+3]:7+9} :3=4

Răspuns :

Ioncojocari99
{[(a :7 +17) :4.3-11]:4+19 } = 4x5
{[(a :7 +17) :4.3-11]:4+19=20
[(a :7 +17) :4.3-11]=4
(a :7 +17) :4.3= 15
a :7 +17=64.5
a :7 =47.5
a=6.7

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