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x-3 supra 6=54 supra 18; aflati x apartine numerelor naturale.

Răspuns :

x-3= 6×54 supra 18
x-3=18
x=18+3
x=21
[tex]\frac{x-3}{6}=\frac{54}{18}\\ \text{Inmultim pe diagonala:}\\ 18(x-3)=6\cdot 54\\ 18x-54=324\\ 18x=378\\ \bold{\boxed{x=21}}\\ S:x=21[/tex]