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[(72:a-12)×36-19×5]-142=195

Răspuns :

[(72:a-12)×36-19×5]-142=195
[(72:a-12)×36-19×5]=195+142
[(72:a-12)×36-19×5]=337
[(72:a-12)×36-95]=337
[(72:a-12)×36]=337+95
[(72:a-12)×36]=432
(72:a-12)=432:36
(72:a-12)=12
72:a=12+12
72:a=24
a=72:24
a=3