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Determinati x , stiind ca : ax+ 3bx+7x=380 si 2a+6b+14=152.

Răspuns :

2(a+3b+7)=152
a+3b+7=152/2
a+3b+7=76 si ax+3bx+7x=380
x(a+3b+7)=380
x·76=380
x=380/76
x=5