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stiind ca: 2a+b=79 2c+3b=99 afla 4a+5b+2c.

Răspuns :

Robertinni
2a+b= 79
2c+3b= 99
__________
4a+5b+2c= ?
__________
2a+b= 79 /·2
4a+2b= 158

2c+3b+4a+2b= 99+158
4a+5b+2c= 257

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