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determinati numarul a din :[( 5 * a +19 ) * 7 - 2 ] : 9 = 34

Răspuns :

(5*a +19)*7-2=34*9
(5*a+19)*7-2=306
(5*a+19)*7=306+2
(5*a+19)*7=308
5*a+19=308:7
5*a+19=44
5*a=44-19
5*a=25
a=25:5
a=5