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1100- [( 512 - 144 : a ) x2 ] - 171=1

Răspuns :

1100-[(512-144:a)×2]=1+171
=172
(512-144:a)×2=1100-172
=928
512-144:a=928:2
=464
144:a=512-464
=48
a=144:48
a=3