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a,b,x apartine numerelor naturale
7a=3b
x supra 42=a supra b
x=?


Răspuns :

x/42=a/b =>42a=bx =>a=bx/42
7a=3b =>a=3b/7
3b/7=bx/42 <=> 7bx=126b sau 7x=126 =>x=18
18/42=9/21=3/7 =>a=3 si b=7