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9*[(342-a*7*3):2+(639-13*6*4):3]=1008

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9·[(342-a·7·3):2+(639-13·6·4):3]=1008

Folosim mersul invers.

9·[(342-21a):2+(639-312):3]=1008| :9

(342-21a):2+327:3=112

(342-21a):2+109=112| -109

(342-21a):2=3| ·2

342-21a=6| -6

336-21a=0

21a=336| :21

a=16
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9·[(342-21a):2+(639-312):3]=1008| :9

(342-21a):2+327:3=112

(342-21a):2+109=112| -109

(342-21a):2=3| ·2

342-21a=6| -6

336-21a=0

21a=336| :21

a=16

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