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100-[250-5×(×-5):5]×3=40​

Răspuns :

[250-5•(x-5):5]•3=100-40

[250-5•(x-5):5]•3=60

250-5•(x-5)=60:3

250-5•(x-5)=20

5•(x-5)=250-20

5•(x-5)=230

x-5=230:5

x-5=46

x=46+5

x=51