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(9×7+n-5×8)-5×5+70=75

Răspuns :

( 9 x7 + n - 5 x8 ) - 5 x5 + 70 = 75
( 63 + n - 40 ) - 25 = 75 - 70 = 5
23 + n = 5 + 25 = 30
n = 30 - 23
n = 7