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Determinati cifra x din urmatoatea egalitate:
2x+x5+2x3=375


Răspuns :

7x+6=375
7x=375-6
7x=369
x=369:7
x=52.71
[tex]2x+5x+2x\cdot3=375\\7x+6x=375\\13x=375\\x=\frac{375}{13}\\[/tex]