(9×7+n-5×8)-5×5+70=75


Răspuns :

(9×7+n-5×8)-5×5+70=75
(63+n-40)-25+70=75
(63+n-40)-25=75-70
(63+n-40)-25=5
63+n-40=25+5
63+n-40=30
63+n=40+30
63+n=70
n=70-63
n=7

Sper ca te-am ajutat. Succes!!!

(9×7+n-5×8)-5×5+70=75
(63+n-40)-25+70=75

(63+n-40)-25=75-70=5
63+n-40=5+25=30
63+n=30+40=70
n=70-63
n=7