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[ 291-( 338:a-289:a+124)×2]×4+4=120.          ( cu toti pasii va rog! )

Răspuns :

[291-(338:a-289:a+124)x2]x4=120-4=116
291-(338:a-289:a+124)x2=116:4=29
(338:a-289:a+124)x2=291-29=262
338:a-289:a+124=262:2=131
338:a-289:a=131-124=7
338/a-289/a=7
49:a=7
a=49:7=7
a=7