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IancuMariaMessiJR10
a fost răspuns

Calculati numarul x din egalitatea 1/3+1/7-x/21=2/21...repede!

Răspuns :

Moldcell20
=10/21-x/21=2/21=>(10-x)/21=2/21=>[21(10-x)]/21=(21*2)/21=>10-x=2
x=10-2=>x=8

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