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Determinati numarul antural a care verifica egalitatea : 100-[60+(2a-30:3)x3]=10.

Răspuns :

100-[60+(2a-30:3)x3]=10

60+(2a-10)x3=100-10

60+(2a-10)x3=90

(2a-10)x3=90-60

(2a-10)x3=30

2a-10=30:3

2a-10=10

2a=10+10

2a=20

a=20:2

a=10