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40-[25+(a×6-22):2+15]:4=5

Răspuns :

[25+(ax6-22):2+15]:4=35
25+(6a-22):2+15=140
25+(6a-22):2=140-15=125
(6a-22):2=125-25=100
6a-22=100x2=200
6a=200+22=222
a=222:6=37

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