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(12-10):1+3×[(57-60:4×2):3+21]:10}=

Răspuns :

(12-10):1+3×[(57-60:4×2):3+21]:10=
=2:1+3×[27:3+21]:10=
=2+3×30:10=
=2+90:10=
=2+9=
=7