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( 245:5Plus5orix)împartit9plus89egal100

Răspuns :

(245÷5+5×X)÷9+89=100
(49+5×X)÷9=100-89
(49+5×X)÷9=11
49+5×X=9×11
49+5×X=99
5×X=99-49
5×X=50
X=50÷5
X=10