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10*{24-[20-5*X-15:3)]:2}=10

Răspuns :

24 - (20-5X-5):2=1
24-(15-5X)=2 (ducem 2 in cealalta parte a egalului si necunoscuta (15-5X) in cealalta parte)
24-2=15-5X
22=15-5X
22-15= -5X
7=-5X | ×(-1)
5X= -7
X= -7/5 (minus 7 supra 5)