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rezolvati exercitiile( 7×9-x×5)-9:3=20

Răspuns :

(63-5x)-3=20
63-5x=20-3=17
5x=17+63
5x=80
x=80:5
x=16
(7x9-x*5)-9:3=20
(63-x*5)-3=20
(63-x*5)=20+3
(63-x*5)=23
x*5=63-23
x*5=40
x=40:5
x=8