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(6×9-z)-3×10+16÷2=4×3×1

Răspuns :

(54-z) -30+8=12 | -8
(54-z) - 30 = 4 | +30
54 -z = 34 
z = 54-34
z= 20

P : 54-20 = 34

(54-z)-30+8=12
(54-z)-30=12-8
(54-z)-30=4
54-z=30+4
54-z=34
z=54-34
z=20
V: (54-20)-30+8=34-30+8=4+8=12