x-numarul
(x×7/12):5/8=1/3
x×7/12=1/3×5/8
x×7/12=1×5 totul supra/3×8
x×7/12 =5/24
x=5/24 :7/12
x=5/24 ×12/7
x=5×1 totul supra/2×7
x=5/14
Probă
(5/14×7/12):5/8=
=5×7 totul supra /14×12 :5/8=
=35/168 :5/8 =
=35/168 × 8/5= se simplifica
=7×1 totul supra /21×1=
=7/21 ( se simplifica cu 7)=
=1/3 (este adevarat a dat egal cu 1/3)
