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10+{7-[12-(18-2×6÷3)÷7+36÷(28÷7×9-6×4÷8×9)]÷2}×2

Răspuns :

=10+{7-[12-(18-4):7+36:(36-27)]:2}*2
=10+{7-[12-14:7+36:9]:2}*2
=10+{7-[12-7+4]:2}*2
=10+{7-9:2}*2
=10+2,5*2
=10+5
=15