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(8+5 +4)+X-15=6

Dau coroana


Răspuns :

17+x-15=6
17+x=6+15
17+x=21
x=21-17
x=4
8+5+4=17  

17+x-15=6                                        

x-15=17-6           

x-15=9                    

x=15+9

x=14