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(6×9-z)-3×10+16÷2=4×3×1

Răspuns :

(6x9-z)-3x10+16:2=4x3x1
(54-z)-30+8=12
(54-z)=12+30-8
(54-z)=34
z=54-34
z=20

Verificare:(54-20)-3x10+16:2=4x3x1
34-30+8=12
4+8=12
12=12