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(9ori7+n-5ori8)-5ori5+70=75

Răspuns :

(9x7+n-5x8)-5x5+70=75
(9x7+n-5x8)-5x5=75-70
(63+n-40)-25=5
(63+n-40)=25+5
63+n-40=30
63+n=30+40
63+n=70
n=70-63
n=7