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Dacă 3×[4+(5+6:2):x+1]=21, atunci x=...
Pls help:( (30p)


Răspuns :

4+(5+3):x+1=7
5+8:x=7
8:x=7-5
8:x=2
x=8:2
x=4
4+(5+3):x+1=21:3
8:x=7-5
x=8:2
x=4