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Aflati x din proporția : 3x+2 supra 5x+4 = 7 supra 12 .

Răspuns :

(3x+2)12=(5x+4)7
36x+24=35x+28
x=4

[tex] \frac{3x+2}{5x+4} = \frac{7}{12} \\ 12(3x+2)=7(5x+4)\\ 36x+24=35x+28\\ 36x-35x=28-24\\ x=4[/tex]