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627+4*[63-(17-n*3)]=835

Răspuns :

627+4[63-(17-3n)]=835
4[63-(17-3n)]=835-627=208
63-(17-3n)=208:4=52
17-3n=63-52=11
3n=17-11=6
n=6:3=2

Deci n=2.