(6×6+21:m)-2×8:4+(20-5×3)=2×4×5
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Răspuns :

(6×6+21:m)-2×8:4+(20-5×3)=2×4×5
(36+21:m)-4+(20-15)=40
(36+21:m)-4+5=40
36+21:m=40+4-5
36+21:m=39
21:m=39-36
21:m=3
m=21:3
m=7