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[21-(648÷24+a)]×3+55=100
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Răspuns :

[21-(648:24+a)]×3+55=100
[21-(27+a)]×3+55=100
[21-(27+a)]×3=100-55
[21-(27+a)]×3=45
21-(27+a)=45:3
21-(27+a)=15
27+a=15+21
27+a=36
a=36-27
a=9