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7-21÷(30÷5÷2)=a-(48÷6)×5

Răspuns :

7-21:3=a-8x5
7-7=a-40
0=a-40
a=40-0
a=40

7-21:(30:5:2)=a-(48:6)×5
7-21:3=a-8×5
7-7 =a-40
-a=-40
a=40