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Cum se face exercitiul acesta? o.o

5(x-1) + 7(x-2)=5


Răspuns :

5x-5+7x-14=5
12x-19=5
12x=5+19
12x=24
x=2
5x-5+7x-14=5
12x-19=5
12x=5+19
12x=24
x=24:2 = 2