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10x (3-x) +6 (x+2)=13+7x (2x-1)

Răspuns :

10* (3-x) +6 *(x+2)=13+7* (2x-1) 30-10x+6x+12=13+14x-7
42-4x=6+14x
4x+14x=42-6
18x=36
x=36:18
x=2