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Determinati x :
[tex] \frac{3x+1}{2x+5} [/tex] din 252 este 20


Răspuns :

[tex] \frac{3x+1}{2x+5} \cdot 252=20\\ \frac{3x+1}{2x+5}= \frac{20}{252} \\ 252(3x+1)=20(2x+5)\\ 756x+252=40x+100\\ 756x-40x=100-252\\ 716x=-152\\ x= -\frac{152}{716} [/tex]