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100-[250-5×5x(x-5):5]×3=40

Răspuns :

[250-5×5x(x-5):5]×3=100-40
250-5×5x(x-5):5=60:3
5×5x(x-5):5=250-20
5×5x(x-5)=230x5
5x(x-5)=230x5:5
x-5=230:5
x=46+5
x=51