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Astea 2 probleme va rog:

X+1 2 7x+21 X+3
------- = ------- ----------- = ----------
15 3 X+2 5


Răspuns :

a)x+1=15•2
————
3
x+1=30
——
3
X+1=10
X=10-1
X=9

Si b nu stiu scuze