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403 -148 -(72:a+547 -398 )+162 =259

Răspuns :

403 -148 -(72:a+547 -398 )+162 =259
255-(72:a+149)=259-162
255-(72:a+149)=97
72:a+149=255-97
72:a+149=158
72:a=158-149
72:a=9
a=72:9
a=8


Proba
403 -148 -(72:8+547 -398 )+162 =
=255-(9+149)+162=
=255-158+162=
=97+162=
=259 (adevarat )