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Determinati numarul natural x , stiind ca : x+1 supra 12 = 5 supra 3 .


Răspuns :

x+1/12=5/3⇒ x+1=12·5/3 ⇒ x+1=20 ⇒ x=19
x+1/12=5/3(amplificam cu 4)
x+1/12=20/12
x=20/12-1/12
x=19/12