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|x-7|+|12-x|=5. Anutati-ma va rog !!

Răspuns :

lx-7l+l12-xl=5
lx+(-7)I+l12+(-x)l=5
lxl+l-7l+l12l+l(-x)l=5
x+7+12+x=5
2x+19=5/-19
2x=-14
x=-7