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1×2-[10+7-(x:7:4)+5×2]:8=0

Răspuns :

notam paranteza patrata cu y si:
1x2-y=0x8<=>1x2-y=0<=>2-y=0<=>y=2
10+7-(x:7)+5x2=2<=>17-(x:7)+10=2<=>17-(x:7)=12<=>x:7=5<=>x=7x5<=>x=35